IBM 3741 Data Station Reference Manual

GA21·9183·4

Systems

IBM

Data

3741

Station

Reference

Manual

Fifth Edition (November 1977)

This

is a major vertical line by a bullet

revision of,

at

the

(e)

at

left

the

of

left

and

obsoletes, GA21-9183-3. Changes are indicated by a

the

change; new

of

the

figure

or

extensively revised illustrations are

caption.

denoted

Changes are periodically subsequent

Requests to

the

A Reader's

revisions

for

copies

IBM

branch office serving

Comment removed, address Rochester, Minnesota

©Copyright

International Business Machines Corporation

made

or

of I BM

Form

your

55901.

to

technical newsletters.

publications should

is

at

comments

Comments

the

information

your

the

back

to I BM

locality.

of

this publication.

Corporation, Publications,

become

in

this manual and will be

be

made

to

your I BM

If

the

property

1973,

of

1974,

reported

representative

form has been Department

IBM.

1975,

245,

1976,

in

or

1977

Preface

This

publication

specific This

information

publication

application personnel, system analysts, engineers gramming for

3741

Data

The

IBM

3741

Entry

System.

els (Models 1 and

Model 2

nications capabilities

Like

the

3741

Work

Station

The

3741

els (Models 3 functions mable Work This

publication

grammable Work

Data

Station.

In

this

publication,

tion

Models 1

mable Work

not

under

about

the

der

control

4 Programmable Work Station General Information,

and

GA21-9196,

Work Station Programming Reference Manual,

This

publication

and

a~pendixes:

• Chapter

view

of

• Chapter 2. Operation Modes and Considerations pro-

vides

information

and related considerations

• Chapter 3. Program Information provides

on

program coding, program chaining,

is

a reference manual

about

the

is

intended

who

wish specific

and

operational

information

Station.

Data

and

is

The

the

Data

part

Station

3741

2).

addition

Station,

of

The

on

Model 2.

the

is

Data

only

of

the

IBM

Programmable Work

and

4).

The

3741

as a

3741

Data

Station

is

under

provides

Station

information

only

references made

or

2 apply (respectively)

Station

control

3741

of

1.

the

Model 3

of

an ACL program).

Programmable Work

an ACL program, see

or

IBM

3741

Models 3

is

IBM

divided

3741

into

Data Station provides an over-

3741.

about

buffers, modes

that

provides

IBM

3741

Data

for installation

sup~rvisors,

and

system

on

the

considerations

part

of

the

IBM

Station

difference

binary

Station

consists

synchronous

IBM

3741

3740 Data

consists

between

Programmable

Entry

Programmable Work

unless

the

3741 Program-

control

of

an ACL program.

about

when it

or

functions

to

the

3741

to

the

4 (when Models 3

For

Station

IBM

3741

and

4 Programmable

the

following chapters.

of

concerning

the

and

Station.

pro-

of

the

IBM

3740

Data

of

two

Model 1

commu-

System.

of

two

Station

the

3741

as a

3741

Data Sta-

3741

Program-

and

information

when it

is

Models 3

GA21-9194.

operation,

3741.

information

operator

guidance.

mod-

Pro-

4 are

un-

• Chapter 4. Production Statistics provides

on

the

production

ing

of

the

counters.

• Chapter 5. Online Field Totals Offline

Field

and offlfne field

• Chapter

7.

disk search,

is

added

to

• Chapter 8

how

• Chapter 9

about

..

to

initialize

..

" Self-Check Feature provides

self-checking

statistic

counters,

and

Totals provide

totals

Second Disk provides

and

copy

the

3741.

Disk Initialization provides

or

check

when

information

capabilities.

operations

a diskette.

using

modulus

information

when

information

and

the

Chapter

on

the

information

10

display-

6.

online

on

second

second disk

or

modulus 11.

• Chapter

the

10.

binary

Communications provides

synchronous

communications

information

feature

of

3741.

• Chapter 11.

provides Printers are used

• Chapter

tion

about

IBM

3713,

information

when

12.

Proof

the

numeric

IBM

3715,

and

IBM

3717

Printers

on

how

the

3713, 3715,

attached

Keyboard Feature provides informa-

key

to

the

3741.

rearrangement

for

and

the

proof

keyboard.

• Chapter 13. Data Recorder A ttachmen t Feature pro-

vides and

5496

information

Data

on

how

the

129 Card

Recorder are used

when

Data

Recorder

attached

to

3741.

• Chapter 14.

the

3741

• Appendix A. Timings provides

for

searches, offline field

ization

•

Appendix

I/O

Adapter provides

can

transfer

data

directly

information

to

or

information

totals,

copies,

and

operations.

B.

Card Punch to Hexadecimal Conversion.

from

a system.

on

disk initial-

on

timing

on

the

3717

a

how

iii

This

publication

data

entry

techniques

tents

of

the

following

•

IBM

3740

System Summary

•

IBM

3741 Data Station Operator's Guide, GA21-9131.

•

The

IBM

Diskette General

GA21-9182.

•

IBM

3742

GA21-9184.

assumes

Data

that

the

reader

and

is

also familiar

manuals:

Entry

System

and

Installation Planning, GA21.-9152.

Information

Dual

Data Station Reference Manual,

is

familiar

with

Manual,

the

with

con-

iv

Contents

CHAPTER 1.

IBM

3741 Data Station Keyboard Display Diskette

Standard Functions and Available Features

CHAPTER 2.

CONSI DE

Buffers

Current Record Previous Record Hold Program

Power On Modes

Read Index Data Modify Enter Mode (E) Update Mode (U) 13 Verify Field Correct Mode Search Mode Field Totals Mode (F) 18

Hexadecimal Data

Multipunch Hexadecimal Display

Deleted Records.

Mode Considerations

Record

Adding Records Data Recovery Bad

Spots on Disk 23 No Record Found (2) Error Seek Disk Read (4) Disk Write (5) Error CE

CHAPTER 3. PROGRAM

Program Coding •

Program Field Descriptions Creating and Storing Programs Displaying Changing a

Program Chaining

Program Chaining Example

Operator Guidance

Prompting Messages.

IBM

3741

DATA

Overview.

Unit

OPERATION MODES

RATIONS

Buffer

Buffer.

Buffer

•

Buffers.

Information

of

Operation.

Index Mode (X)

Track

Data

Set

Set Label Error Checking

Index Mode (M)

Mode (V)

(S)

Operations.

I nsert Feature

Insert Mode Characteristics

to

(3)

Error

Mode.

Programs

Program

Labels

(C)

.

• 15

for

a Batch

Error.

INFORMATION

in

a Program

•

STATION

AND

Deleted Records

Buffer.

•

CHAPTER 4. PRODUCTION STATISTICS

Counters. 2 2 3 4

5 5 5 5 5 5 5 6 6 8

11 11 12

13

15

18 19

19

19 20 20 21 22 22

23 23 23 24 24

25 Copying a Record

25

25 28 30 30 30 31

31 32

Keystroke Counter . Record

Counter.

Verify Displaying Production Statistics Track

CHAPTER 5. Online Field Totals

Programming Online Field

CHAPTER 6. Offline

Programming

Control

CHAPTER 7. SECOND Dual Disk Operation on the 3741 • Search Operations Copy .

CHAPTER 8. Initialization Procedure Disk Checking

CHAPTER 9. SELF-CHECK Computing the Self-Check

Correction Keystroke Counter

to

Record Conversion Table

ONLINE

Displaying Field

Accumulate Totals Fields

Read Out/Reset Field

Online Field

Example.

Auto

Field Totals Operation

Displaying

Accumulate Totals Fields

Read Read

Control Statement Format Character Description Examples. Unconditional Offline Program Program Program Offline

Copy Copy Copy Up

Modulus Modulus

Total

Balance Example •

OFFLINE

Offline

Out

Field Totals Fields

Out/Reset Field Totals Fields

Statements.

Program

Field Totals Example

Buffer

5

Buffer

6

Buffer

7

Field Totals Setup Example

on

All

(Image Copy)

All

(Image Copy) to

a Specified Record on Disk 2

DISK

10

11

FIELD

Total

FIELD

Total

Buffer

DISK

or or

Digit

TOTALS

Fields

TOTALS

Accumulators

Fields •

Selection.

Part Part

FEATURE

Operation.

Totals.

Restrictions

Field

the Second Disk

INITIALIZATION.

of

Disk 2

of

a Data Set

34 34 34 34 34 34 35

36 36 36

36 37 37 38 38 39

40 40 40 41 41 41 41

42 43 45 46 46 47 47

47 47

49 49 49 50 50 50 50 50

51 52 53

55 55 55 56

)

I

v

CHAPTER

Features .

Communication

Transmit/Receive Mode Examples

Operating Procedures

Line

Termination

Track

COMMUNICATIONS

CHAPTER

3717

IBM

Functions

Printer

W

Editing

10.

Networks.

Synchronous Clock . Terminal Operator Keylock

Expanded Communciations Feature

Expanded

Control

Programming

Transmit Expanded Communications Transmit-Transparent Mode Transmit Receive Mode Receive Mode Transmit/Receive Mode (B) Expanded Communications Transmit/Receive

Mode Transmit-Transparent/Receive Mode (D) . Writing

Transmitted

Inquiry Binary

Termination

Inquiry BSCA BSCA

Status BSC Error

PRINTERS

COMMUNICATIONS

Identification. Identification

.

Communications/Multipoint

Feature

Support

Modes.

Mode (T) .

Mode Examples . .

(R)/Expanded Example.

(K)

of

Received Data Over Previously

Data .

Mode (I)

Synchronous Communications Summary

and

of

Mode

Termination.

Error

Conditions

Disk Errors

and Sector Indicators

Message

Status

11.

Format

IBM

CE

Recovery Procedures

Card Reader

Transmit

(P)

Error

the Data Call .

Line.

Conditions

and Indications

.

THROUGHPUT

3713,

IBM

•

3715,

Data

Mode (J)

Communications Receive

AND

IBM

Link

3713 Printer

IBM

3713 Adjustable Margins Feature

IBM

3713 Forms Stand Feature

3715 Printer 96

IBM

3715 Forms Stand Feature 96

3717 Printer 97

IBM

3717 Forms Stand Feature • 97

Printer

Modes 97

Printer

Formatting

Local

Format

Control Horizontal Local Processing

U

Error

Editing Editing

Tab

Format

Error

on

and Vertical

Control

Unit

Format

Conditions

(Printer) 110 (Printer

the

Consideration

Example 114

Format) 110

3715 and 3717 •

Skip

Example 104

Control

Stop Characters 102

57 59 61 61 61 62 62 63

66 68 68 69

69

70 71

72

74

76

77

80 81 82 89 89 89 89 90 91 92 92 92 94

95 95 95 95

97

98 99

107 110

111 111

CHAPTER

FEATURE.

CHAPTER

ATTACHMENT

Punch Operations

Read Operations

Format Card Read/Punch

Function How

CHAPTER File

Error

APPENDIX

CONVE

CARD

HEXADECIMAL

CARD

PUNCH

GLOSSARY.

INDEX

12. PROOF

13.

Punch Modes

Read

Modes.

Current Record

Program Level A Card

Read/Punch

Card Read/Punch

Switches .

Format

Control

14.

Transfer.

Mode 1 Mode 2 Mode

3

Mode 4 Mode 5 Summary

or

Disk Errors . System Channel

of

Write)

Recovery Procedures

A.

TIMINGS

B.

CARD

RSI ON •

PUNCH

TO

PUNCH

TO

ORDER)

KEYBOARD

DATA

RECORDER

FEATURE

Buffer

Format

Control

Format

Control

Format

Instruction

Works

Examples

I/O

ADAPTER

File

Transfer Operations (Read

Errors.

•

PUNCH

HEX

ORDER)

HEX

TO

HEXADECIMAL

CONVERSION

Programs.

Set

..

(IN

CARD

116

117 117 117 118

118 119 120 120 121 121 122 123 124

130 130 131 131

131

132 132

133 134

134 134

135

136

137

138

140

vi

Chapter 1.

IBM

3741 Data

Statio~

IBM

3741 DATA STATION OVERVIEW

The

IBM

3741 Data

System.

used I

BM

Model 1 (Figure keyboard

and a control

Model 1, with munications adapter.

Once

the

use only,

• Converted

The

to

record data

diskette.

unit,

data

has been recorded

data

can be

of

binary synchronous

or

for

Models 1 and 2,

Station

tBM 3741 Data

on

1)

is a standalone

one display unit, one

unit. Model 2

the

addition

transmitted

to

tape

Display Unit

is

Station

a data recording

(not

of

a binary

on

to

communications.

the

by using

part

of

the

is

a key medium

device which has

or

two

pictured)

synchronous

the

diskette

another

the

data

IBM

location

can be:

3747

3740

Data

entry

device

called

one

diskette

is

the

same as

com-

by

the

3741,

through

For Model 2

Data Converter

Entry

the

units,

the

• Processed by

els 3

or

• Used with which provides direct

• Printed by

Note:

The

4, operates as a 3741 Data

Station

Work

program Model 3 has Model 1;

able features as

4 Programmable Work Station Programming Reference Manual,

mable Work

GA21-9194, for

Diskette Unit

the

3741 Programmable Work

4

the

IBM

3540

Diskette

input

capabilities

the

3713,

3715,

or

3741 Programmable Work

Station,

is

under

Application

control.

and

When operating as a

the

same

functions

the

Model 4 has

the

Model 2. See

Station,

under ACL program

No.2

the

information

Diskette Unit

Input/Output

to a System/370

the

3717

Printer

Station,

unless

the

Control

and

same

IBM

Language (ACL)

Data

Station,

available features as

functions

3741 Models 3 and

on

the

3741 Program-

control.

No.1

Station

Unit

Models 3 and

Programmable

and

Mod-

the

avail-

Control Unit

)

Figure 1.

IBM

3741 Data

Station

Keyboard Unit

IBM

3741 Data

Station

Keyboard

The

keyboard function and switches. Data keys provide 64

different codes can be keyed with function keys as indicated by top

row

in

green,

(Figure

keys,

function

displayable characters.

select keys are used

of

keys.

is

associated with

the

The

2)

consists

select keys,

the

two

lefthand

use

to

rows

the

of

data

two

the

means

All

of

the

redefine

of

labels above

function

upper

row

keys, special

rows of labels,

of

keying

256

EBCDIC

HEX key.

the

select key, lettered

of

top

labels

The

row

the

(that

of

is,

redefines

of

labels), which are also green. select key, row

of ADV, RESET, etc.) perform specific entry. automatic functions. keys

Guide,

the

top

row

of

keys according

The

lettered

labels.

The

record advance, and program numeric shift

and

switches, see

GA21-9131.

in white,

The

special keys (DUP,

switches provide

For a complete

the

IBM 3741 Data Station Operator's

is

associated with

automatic

description

to

the

righthand

FI

functions

skip/duplicate,

of

function

the

ELD BKSP, REC

during

the

keyboard's

top

lower

row

data

Figure

2.

3741 Keyboard (Model 1)

Display

The

display (Figure 3) provides program Data screen. Line 1 indicates the display the and (underscore) character

A

information,

Station

first eight positions (total

display

6 are used

complete

uses six 40-character lines

either

data

mode

is

to

be

description

and

or

program information, depending

selected. The last

for

the

operator

used

to

entered.

indicate

of

station

status

data

on

the

screen.

of

the

station

status. Lines 2, 3, 4,

of

128

positions)

30

positions

guidance feature. A cursor

the

position

the

display

is

provided

IBM 3741 Data Station Operator's Guide, GA21-9131.

2

information,

The

3741

display

and

of

line 5

of

line 5

of

the

upon

Status Line

Guidance Message

Figure

3.

Display

3 A A

ADDRESS

112

Unit

with

01001

MAIN

STIIIIIIIIIIIIIIIIIII

Operator

Guidance

Cursor

E R

(

Diskette

The

disk

Unit

unit

Figure 4 shows

tion

of

the I BM

see

dling,

The

GA21-9182.

reads

and

writes

on

one

side

of

the

the I BM

diskette,

IBM

diskette.

its

For a complete

layout,

care,

storage,

Diskette General Information Manual,

diskette.

descripand

han-

Figure 4. I BM

Diskette

)

IBM

3741 Data

Station

3

STANDARD

Figure 5 for

shows

the

3741.

Standard or

Feature

Function

Communications

FUNCTIONS

the

standard

AND

AVAILABLE

functions

IBM

(Models 1 3741 Station*

Standard

Model 2 available

1 or 3

FEATURES

and

available

3741

Data

Station

and

2)

Programmable

(Models 3

on

the

3741

or

4;

not

on

Model

features

and

Work

and

IBM

4)

Standard or

Second

Function

Feature

disk

Synchronous

Terminal

1200

identification

bps

integrated

modem

clock

IBM

3741 (Models 1 3741

Programmable

Station*

Feature

Data and

2)

(Models 3

on

Model 2

on

Model 2

Station

and

Work

and

or

IBM

4)

4

Expanded communications

Entering

and

updating

records

Operator

Program

Record to

Search

Sea rch

Search

128

guidance

chaining

length

characters

on

content

on

end

on

record address

on

sequential

content

Ten levels

of

program

control

of

1

data

Feature

or

4

Standard

on

Model 2

Nonswitched

Switched answer

3713

Printer

3715

Printer

3717

Printer

Feature

group

Disk

initialization

Offline field

Online field

Production

Self-check

(modulus modulus

with

A:

totals

statistics

number

10

and

11)

auto

Feature

Data

recorde r attach

Disk

copy

Keylock

Operator card

Proof

Record

*Not

Figure 5 (Part 1

4

reader

keyboard

insert

under

identification

ACL

of

program

2).

Standard

ment

control.

Feature

Standard

Feature

Functions

and

on

second

on

Model 2

on

Model 2

Available Features

disk

or

Verify

*Not

under

ACL

Figure 5 (Part 2

program

of

2).

control

Standard

Functions

and

Available Features

4

Chapter 2.

Operation

Modes

and

Considerations

Entering, disk

is

performed

modes

of

formed

directly operating. fore, is

BUFFERS

Buffers data are hold

Current

The are buffer. current

by

dependent

the

different

are

between

the

current

buffer,

current

keyed.

Data record

updating,

operation.

the

control

Each

use

of

in

each

temporary

the

record

and

Record

record

Records

displayed

buffer.

verifying

by

the

The

upon

mode

buffers,

mode.

keyboard,

program

Buffer

buffer

read

data

sequence

unit

within

the

of

operation

keys,

storage

buffer,

buffers.

receives

from

on

the

or

searching

stations

the

mode

and

information

areas used

display,

disk

display

using

of

operations

data

in

which

is

unique,

and

disk.

record

characters

are

also

screen

of

data

different

station

the

and,

displayed

for

transferring

The

buffer,

placed

is

from

on

a

per-

is

station

there-

buffers

as

they

in

the

this

Program

The and A.

is

that field contain requ ired See Chapter 6. Program prompting guidance,

Buffers

3741 has 10

The

control

totals

some

in

program

record

format

operations,

field

totals

order

to

perform

Offline

buffers

are

also

message

see Operator Guidance

records.

buffers

the

control

usually and program

the

Field Totals

used

For

numbered 1 through

contain

processing.

buffers

statements

field

for

to

contain

information

in

Chapter 3. Program

totals

more

operator

For

will also

that

operations.

programs

offline

are

information.

guidance

on

operator

9

Information.

POWER ON

When

record, program selected. disk

status

and

current

the

status

INFORMATION

the

3741

and

hold

buffers

The

(N),

disk

line

is

turned

buffers

are filled

status

the

address

are

blank.

on,

the

are filled

with

I ine displays

read

index

00000. All

current

with

blanks,

N's.

Program

the

machine-not-ready

mode

(X),

other

record,

buffer 0 is

program

positions

the

level 0,

on

)

previous previously is

written

buffer

is

by

the

control

in

the

current

Hold

Buffer

The

hold when

in

during

search

operati

ons.

Record

record

displayed

on

the

buffer

verify

Buffer

disk

unit

record

contains

mode.

on

content

buffer

in

the

from

which

for

duplicating

buffer.

the

This

contains current this

or

search

the

record buffer. characters

The

into

duplicate

record

contains

on

sequential

record

buffer.

to

be

the

that

was

Data

obtained

fields

verified

search

content

record

mask

Closing changes

is

volume

allow acter) the Then

A positions 9 and other

If

since

If

Sector label

read

disk

write

the??

all

tests

defines

the

but

label

(field

use

of

cannot

the

3741

test

disks

continues

the

machine

08

contains

cover

machine

not

displayed,

is

checked.

is

blank)

a disk. If

waits

is

made;

should

are

successful,

required

on

the status

be

processed

for

10

of be

to

cannot

the

diskette

to

and

The

or

inhibit

the

accessibility field

and

the

diskette

if

not

successful, ??

the

status

inserted

be

displayed,

write

sector

first

data

information

Index Track Data Set Labels in

information). can

now

Data

be

performed.

entry

or

other

that

has

been

wait

(W).

The

the

accessibility field in

accessibil

(field

to

this

ity

contains

an A error

to

line.

If??

see if

the??

call I

records

08

on

is

read

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Figure 8 shows following set label.

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Operation Modes

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incorrect

begin-

is

other

is

from

is

read,

set

If

data

Modify

The

the be modified

Index

modify index

index

track.

volume label,

Mode

Fields

by records can also be index

mode

function_

To

perform a modify

record advance

record

to

select

modify

.only;

(M) modify

are give a to

mode

if it

error

mode.

the

only

function

read index

selection

to

be modified, key

by can

is

selected from

occurs. No

DELET~

valid keys

not

after

of

modify

(M)

mode

is

used

or

using

deleted

get

in a data

other

the

index

to

the

set

records

modify

with

function,

appropriate

the

pressing. FUNCT

be

selected

from

another

other

mode

REC, RESET,

in

the

modify

available (F)

the

first

keystroke

mode.

to

modify

label, new

on

the

index

mode.

the

use

of

record backspace

record

to

SEL

lower and

the

read

mode, a mode

can

be

and

mode.

error.

The

following

records

data

index

Any

the

modify

index

track

be

written,

index

selected

REC ADV

All

mode

on

the

set labels,

track

can

of

the

then

M.

The

mode

selection

from

the·

others

reverts

the

or

\

)

/

Operation Modes and Considerations

11

Enter

Mode

(E)

Enter

mode

is

mode

can

be

selected selection any

write

mode,

As current a

record ferred record previous record

The

mode current set keyed

(M)

other

position

new

information

press FUNCT

the

operator

record

advance occurs,

to

the

is

being

data

flow

is

selected,

record

to

blanks.

into

the

previous record

the

most

error

results if

on

SEL

keys a

buffer

keyed

is

written

is

summarized

the

disk

buffer

The

station

current

basic

from

the

disk.

on

lower

record,

until

the

into

on

and

the

record

mode

of

the

index

enter

mode

Enter

the

disk.

To

and

the

data

the

record

completed

buffer.

the

current

the

disk.

in

Figure

is

positioned

previous record

is

then

ready

buffer.

operation.

track

is

selected from

mode

select

then

press

is

stored

is

completed. record

While

record

9.

When

at

BOE;

to

accept

Enter

only; a mode

is

used

to

the

enter

ENTER.

in

the

When

is

trans-

the

enter

the

buffer

are

data

Alternate Record Advance in Enter Mode

An

alternate

be

selected

dash

will

record advance all fields of

record advance are

fields being

record

REC ADV the

disk

automatic

normal record advance duplicate tion

at

To

return

FUNCT power

method

by

appear

that

follow

executed.in

advance.function

key

exactly

duplicate

and skip fields

the

time

the

SEL

lower

on

will also establish

of

pressing FUNCT

in

position

function

the

is

pressed,

as

the

or

of

record advance.

machine

and

record

advance in

SEL

lower and

39

in

the

in

enter

mode

position

not

normal ent'er

has

operator.

skip

may

that

to

K. Inserting a.disk

of

executed

the

fields are

cause changes

the

in

this

.advantage: When

record

sees it on.

are

beyond.the

normal

the

is

status

is

contrast

mode.

always

executed).

enter

mode.

Right Adjust Fields

enter'

then

line.

changed so

cursor

at to

The

written

the

display (no

in

automatic cursor

mode,

or

turning

mode

R.

The

that

the

time

these

alternate

the

The

posi-

press

can

A

on

the

As

data

is

stored

in

the

record

buffer displayed screen.

.-At

record

the

data

is

to

the

buffer

written The is to to

current

filled

allow key

data

on

with

the

keyed,

current

and

on

the

advance,

moved

and

the

disk.

record

blanks

operator

record.

Flow

it

is

.....

for

f-----

Enter

•

Mode

Keyboard

[f

Display

01

0

Disk

Programmed right

current

pressing be record. exit pressed, in boundary.

J]

•

first depends See Right

Pressing right

The

the units an 3=L, if right 21 and

field

the

at

least

two

In

enter

a right

the

field (up

keyed

on

Adjust

the

adjust

dash

(-)

programmed

number

(rightmost) position

alpha

equivalent

4=M,

5=N,

the

digit

adjust

is

entered

the

dash key

(negative

21).

adjust

to

be moved

RIGHT

adjust

3741

Fill

character

the

ADJUST

characters

mode,

the

field. When

shifts

to

the

cursor

characters

as required.

field

definition

the

Fields in

RIGHT

field

and

is

field have

ADJUST

enters

fill

key,

when

used in a right

for

numeric

then

causes

if

the

6=0,

7=P,

O.

The

numbers

their

in a five-position,

is

pressed,

fields allow

to

the

long

RIGHT

characters

position)

are

Chapter

characters

shift,

the

of

the

digit

8=0,

numeric

the

data

right field

key. Right

and

can

ADJUST

the

RIGHT

inserted

The

character

3.

key

in

the

into

gives a negative value

field

to

negative

is 1 through

9=R)

in

the

other value.

zero

fill, right

field will

entered

.boundary

adjust

fields

be as long as a

key

is

ADJUST previously to

the

to

the

fill

character

used

first position

adjust

be

number

or

the

contain

entered

right field

left

of

for

the

entire

field

exited.

9 (1=J, 2=K,

hex

code

positions

For

example,

adjust

0002J

into

the

by

must

whole

used

key

is

the

used

the

field.

of

field.

that

is

to

The

contains

DO

of

the

field

to

a

if

12

Note: Performing a

will cause

the

right

character

adjust

fieJd

advance

to

be

or

field advance

exited

in

enter

mode.

Update

Use review

FUNCT

Data selected update tioned

the the selection (M) error. However, changes occurs matically changes

operation.

mode beginning-of-extent set

If record advance reaches EOD

mode

However, if label (a

set

Record

disk record displayed. changes are

into buffer.

Record

transfers previous and reads into buffer. If changed written

the

record update

is

the

is

into

current

flow

empty.

of

data

full (an

Mode (U)

update

or

modification.

SEL

lower

is

summarized

from

the

is

selected

at

BOE; if

at

the

mode

to

the

during

the

An

is selected

operation

an

automatic

set

is

write

protect,

end

is

read

current

buffer

and

Any

keyed

record

advance

data

to

record

data

the

record

to

disk.

mode

to

and

read

index,

from

update

current

from

update

mode

enter

to

update

empty

data

when

the

address;

automatically

protected

G,

of

extent,

from

.....

'----

-----t~

buffer

---------------1

record

was

is

read To

select

then

in Figure

the

index

is

selected

disk address

the

enter

when

mode.

mode

set

end-of-data

return

by a write

error

E,

Keyboard

records

press UPDATE.

search,

in

the

10.

track,

from

mode

the

mode record

The

search

at

the

(Y)

error

other

words,

during

changes

to

index

is

displayed)

error

is

DL--I

from

update

Update

or

verify

the

is

reread. Selecting

results

automatically

backspacing

end

occurs

address

update

to

track

protect

displayed).

_-I

•

o

...

-------

Disk

n:

(

ACM[(ORPQRATIOh

l

]

~

Display

the

disk

mode,

mode.

disk

verify

in a mode

mode

of

equals

when

mode,

enter

is byte

or

if

for

press

mode

can

If

is

posi-

mode,

also

auto-

a search

if

update

the

data

the

mode.

performed

in

the

data

1

"

~

Verify

Mode (V)

Use

the

verify

mode

to

check

be

already

when

similar is automatically in

do

To then

index

verify

matically filled is

Verify Selecting verify event

rections

source displayed.

changes

record

Next from hold

The transferred

advance record

displayed.

on

errors

to

rekeyed

the

record

not

compare,

select

press

or

mode

read

into

mode

that

to

record

made

is

record disk

buffer.

~

record

to

buffer

the

disk and

are

found.

that

of

entering

from

the

source

compared

in

the

current

a verify

the

verify

mode,

VERI

FY.

Select

update

mode.

is

selected,

with

blanks,

the

current

can also

the

is

By selecting verify

to

redisplayed.

is

into

.

IS

at

record

the

and

mode

operator

record

being used

the

record

read

......

f------

the

current

be

from

being

____

to

make

The

data.

document,

with

mismatch

press

For

the

record

selected

discovers,

to

t

Keyed

data

is

com-

pared

with

the

data

in

the

~u:::~;

transfers previous

Data

only changed.

Figure

:~~~~~:uffer.

data

to

record

is

written

if

data

11.

was

Data

on

Flow

buffer.

the

for

~

z-w~~<

disk

-.-;.-----------1

Verify

the

accuracy

corrections

process

record

the data

verify

displayed,

are ignored

of

As

the

corresponding

buffer.

(V)

FUNCT

verify

flow, see Figure

record

the

first

buffer.

from

mode

after

verify

the

mode

from

01

Disk

.~I

Display

_.

Keyboard

Mode

of

to

verifying

data

for a record

each

character

If

the

error

occurs.

SEL

mode

from

buffer

non-deleted

verify

mode.

is

provided

making

that

the

record

verify

and

the

____

o

data

records

the

data

character

characters

lower

read

11. is

some

wrong being

mode,

entire

•

_.

~

records

is

and

When

auto-

record

in

the

cor-

all

--'

Figure

10.

Data

Flow

for

Update

Mode

Operation Modes and Considerations 13

Display

Duplication Functions

During verification, not

including record current tion,

or

ing

the

is

displayed (1)

record

buffer,

(3)

when

RESET

key

cursor

an

Error Correction

If a

character corresponding following

The

1.

2. A verify status

The

3.

4.

The

Use

RESET

the

character

The

first

the

character

current

If

the

first accepted, The

correction

have been

keyed

character

occur:

keyboard

mismatch

line.

cursor

entire

record

to

reset

in

error.

character

keyed

record

buffer

character

a verify mismatch (V)

process

made

to

Skip Functions

If

SKIP

is

pressed

tered

during

verification,

of

the

field

is

checked

is

encountered,

action

terminates, displayed. can

be

replaced

then

continues

blanks.

the

After

with

to

the

data

record

position. However,

after

the

record

(2)

after

a record backspace opera-

error

occurs.

returns

is

key

the

or a programmed

and

pressing RESET,

check

the

normal verify display

while verifying

in

the

current

locks.

(V)

error

under

the

position

is

displayed.

the

error

condition

following

agrees

with

either

or

the

character

key

pressed following

error

is

continued

record.

the

entire

for

blanks. If a

cursor

stops

in

a verify mismatch (V)

a blank

by

the

remainder

pressing SKI

is

displayed

is

moved

The

keystroke

is

not

record

code

is

in

error.

and

the

error

the

that

is

again displayed.

until all

skip field

field

or

nonblank

that

position,

the

non-blank

of

up

the

entire

into

follow-

the

same as buffer,

displayed

then

correct

is

accepted

character

caused the

error

corrections

is

encoun-

the

remainder

character the

error

character

P.

The

the

field

to

the

mode.

on

in

the

is

skip

is

station

for

but

the

if

the

error.

not

Pressing DUP during verified current characters in acters acter

in

is

posted. previous record record

comparing

When using

in

the

characters in program

or

entering a programmed

data

verification causes automatically. record

buffer

the

previous record buffer. If

in

the

record disagrees

the

previous record

After

RESET

buffer

by

pressing DUP.

the

field.

the

auxiliary

current

record are

The

are

compared

is

pressed,

can

be

duplication compared

buffer

the

characters

with

buffer,

inserted

The

4.

Right-Adjust Fields

If a right-adjust field

the

cursor stays

first

data

key

depending

first character

When fill

of

the

at

the

To

exit character (-) field's sign, unless used right-adjust field is

verified in

tion

If a verification right-adjust field, a right adjust sign The sign can dash key twice.

Press RIGHT from every even ther

Failure right-adjust field causes right data

on

data

character

in

the

characters

field, When

first non-fill

from

the

in

the

key. RIGHT

to

verify a

the

in

the

field.

be

ADJ

programmed

when

one

and

when

to

press

keystroke.

is

encountered

in

the

first position

is

pressed.

the

field. If

right-adjust field

field, press

numeric

is

same

error

changed

right-adjust field immediately follows ano-

right-adjust fields

RIGHT

The

fill characters are

field

definition

keyed

is

compared

neither

are in

error,

data

does

not

character.

either

ADJ

and

the

dash key also verify

the

field

is

alphabetic. (The dash key

field having a minus sign.) If

alphabetic,

way

occurs while verifying

or

the

as a

by

pressing

dash key, if applicable,

right-adjust

ADJ

or

adjust

duplication

rest

of

the

of

the

with

the

one

the

corresponding a verify the

characters, and

agree, an the

match,

after

RIGHT

last

character

contain

the

mismatch

character

into

the

device

then

feature,

with

the

while verifying of

the

field until

with

error

cursor

the

verifying

ADJ

character

in

(X)

error

of

RIGHT

fi

eld. Press

all fill characters.

dash

key

(R)

error

field

to

be

record

in

the

corresponding

of

the

char-

error

from

the

current

continues

the

characters

corresponding

data,

the

compared

then

the

first nonfill occurs.

is

at

the

start

cursor

is

the

last

or

the

dash

the

in

the

field

any

other

posi-

the

sign

of

a

is

displayed.

ADJ

or

the

to

exit

the

key

at

the

end

on

the

of

a

14

When a right-adjust field record

on

the

3741 and RIGHT is

In verify

only

129

ADJ

for

when

has

the

mode,

the

not

3741,

RIGHT

cursor

is

the

yet

been pressed,

and

the

ADJ

is

in adjust field (to verify a zero field

is

full

(the

cursor

will have moved

of

the

If

these keys are pressed

sor

is

in

any

other

position, a right

Signs

If

the

units

a negative

position

number

of a numeric

(0

zone), field are verified separately. units

position

ed,

only

not

affected.

The

dash key also verifies

If

the

units

(dash)

but pared. If from

the

ter

in a

with

the

verifies

the

digit

To

position

the

corrected,

field using

numeric

dash key.

the

digit. I f

portion

exit

field

is

from

of

a right-adjust field has a 0

is

alpha,

the

entire

RIGHT

right-adjust field, press ALPHA SH 1FT

the

last field in a

128-character

field has been verified

the

cursor

is

not

displayed.

or

the

dash

key

the

first position

or a blank

field)

to

the

of

when

adjust

(R)

right-adjust field the The

changed.

the

field, use

the

sign.

the

character

ADJ.

sign and

first

entire

the

keystroke

the

character

The

sign

the

character

is

changed. Exit

To

verify a dash charac-

but

position

should

be used

the

right-

or

when

the

first position

the

cur-

error

occurs.

contains

value

of

the

for

the

is

correct-

(0

zone)

dash key.

zone

is

com-

function

Pressing record advance the automatic

remaining

and

the

first manual

skip

automatic

operator

position

and

manual fields

duplicate

is

forced

to

verify

the

when

the

cursor

is

in

other

of

a record causes all remaining

to

be verified as blanks;

fields

are

verified

record.

than

and

bypass

fields are bypassed.

Verification Code

After

the

last record in a verification field

of

the

to

a read index

of

extent

(E)

code

data

alert

(V)

set

mode,

data

is

automatically

label,

the

is

displayed,

data

set

has

mode

set

and

been

inserted in

of

operation

label

program

verified, a

is

displayed,

level 0

the

verify

changes

end

is

selected.

Correct

is

Field

correct

with a minimum

mode

can be selected

the

field moves field can of

the

field

first position

correct

to

the

be

Mode (C)

mode

number

mode,

first

rekeyed

is

reached,

of

the

may

be used

from

press

position

as if

the

field

of

keystrokes.

the

verify

FIELD

of

the

in

the

enter

cursor

and

the

to

correct

mode

COR.

current

mode. then mode

an

The

only.

The

field,

moves

changes

entire

field

cursor

and

When

back

to

field

correct

To

select

the

to

the

verify.

end

in a mode

mode character field.

Mode (S)

mode

on

record address

mode.

to

end

on

content

on

sequential

mode.

flow

information,

correct

Selecting field

Hexadecimal Data

Verify hexadecimal

Press HEX.

1.

data

in

the

same

way

it

is

entered:

while processing a

mode

results and CHAR ADV are valid in field

correct

field

or

current

2_

Press

two

character decimal digits the

last

keystroke

keys

wanted.

for

corresponding

The

character

that

character.

to

is

verified

the

hexa-

after

Search

Use search

Record Advance

• Search

When a record advance the

record

is

rewritten

were

no

corrections

record advance. If

taken

place

has tion

of

the advance record.

the

cursor

I

/

record,

pressing REC ADV will

and

record, pressing REC ADV causes a record

function

If

a

correction

is

positioned

to

no

verification

the

to

occur

is

performed

on

the

record,

cursor

without

had been

at

the

disk as

it

or

is

in

verification

made

first

manual

not

the

cause a

on a corrected

corrected.

is

not

correction

If

rewritten

to

first manual posi-

of

to

the

record,

position

record

there

during

a record

the

and

of

the

advance

enter

• Search

• Search enter

For

data

mode

programmed

selection

changes back

backspace

to:

of

data

from

content

when

not

automatic

(M)

the

field to

the

moves

the

from

read index,

index,

read

index

from

see Figure

in

verify

field in verify

error.

correct

verify

cursor

enter,

or

update

read

index,

12.

mode

FIE

LD mode. mode

out

update,

update

mode.

or

ADV

The

when

of

the

or

mode.

update,

a

or

Operation Modes and Considerations

15

Note:

After

. EOD,

but

before pressing R

can be canceled

RETURN

and

Mask the

brter

Mask hold start

Records are read current and the buffer is

found.

found

TO

UPDATE.

is

keyed

current

compared

mask in

record

ar

displayed.

is

transferred

buffer

at

of

the

search.

record

until a

The

is

displayed.

the

pressing

match

any

search key,

EC

AD V,

by

pressing FUNCT SEL lower and

INDEX

into

the

buffer

with

record

or

~

to

into~

hold

by

pressing FUNCT

.

Kr~::.

:=;b=":=:r=.:=====.

t )

\...::::::=====~

Display

0

__ ' __

o

Disk

except the

search

•

-1

for

search

operation

SEL

=,

:-"l)

lower

The

track

and

sector

of

extent

address,

the

address Select operation Selecting other

The

search record record

displayed record changes

updated

or

reviewed,

A search address

is

specified

equal of-extent

the

index

sor moves

play screen.

Search job.

verify

displayed.

Search to End

of

any

the

search

from

the

search

mode

causes a

stops

at

the

specified address

buffer

and

to

the

or

reviewed. Once

another

incorrectly,

to

the

end-of-data address

address

track.

to

the

on

record address can be used

This

is

done

mode

when

of

address specified can be

the

end

of

data

address minus

record

between

mode

to

do

the

read index,

by

record address

mode

selection

on

the

record address specified and

the

previous record

at

the

end

update

mode.

search can be initiated

(I)

error

is

if

the

for

the

data

If an invalid address was

first position

by

initiating

the

record

Data

these

a search

update,

is

displayed.

of

the

search

The

record can

the

record has been

displayed if

address

or

set,

or

of

the

search

at

the

beginning

one,

two

addresses.

by

record address

or

enter

mode.

function

(M)

buffer

the

is

greater

less

than

if

the

data

to

specified address

from

error.

The

current

contain

and

the

mode

now

updated

from

search address

than

the

beginning-

address

entered,

line

on

the

continue

and

then

this address.

a verify

or

any

the

be

or

is

on

the

cur-

dis-

selecting

is

IL-

___

~.

(.:::""""n;,

l

Display

Figure

12.

Data

Flow

for

Search

Mode

Search on Record Address

Search

on

record address allows set using record addresses. Search especially useful if specific records have you

know

the

To

search address. where

TT

The

record address

the

display.

addresses

for

a record in a

The

specified address

is

the

track

number

is

keyed

of

the

data

into

you

to

on

records.

set,

key its

must

have

and

SS

positions 1

record address

is

search

to

be

track

the

format

the

sector

through 5 of

updated

.,

)

through a data

is

and

sector

TTOSS

number.

Search

to

end

the

last

data

records

data

EOD. Select the other

When set is set operation

to

set,

press FUNCT

read

index,

mode

the

search

equal

to

displayed.

equal

to

changes

the

of

data

record in a

data

set.

the

search

enter,

results

in a mode

is

completed,

the

last record

The

contents

the

current

to

is

used data To

SEL

to

the

or

update

in of

record

update.

when

you

want

set

and begin adding new

search

to

the

last record

lower

and

then

end

of

data

function

mode. Selecting

selection

the

buffer

(M)

current

data

previous record

disk address

set

and

the

to

search

to

of

a

press SEARCH

from

any

error.

is

the

record

buffer

mode

of

is

16

Search on Content

Use search the tion called a mask. of

a record and character search will match character

the

in

ly

as a field ABIbCD contains in

the

EBCD

field.

Searching by beginning the

Select or

update

mode

Following a search contains the been searched and no record a search

To

continue press FUNCT ADV in

If a the search

momentarily deleted record deleted

on

content

current

3741

deleted

data

of

specified

of

the

identifying characters and

The

mask can be

may

positions

stop

between

is

mask;

character

in

a record

is

used,

AB

last

two

IC

characters

with

sector

the

search

mode.

causes a

the

is

in

(S)

that

in

the

continues

record

do

only

the

record

used

to

identify

therefore,

within contains the

search will

in

the

first

positions

might

content

the

on

content

Selecting

mode

operation,

same

data

update

error

is

displayed.

searching for records using

SEL

lower, SEARCH CONTENT,

order.

record

Do

is

deleted

and a deleted

on

the

status matches is

displayed.

to

find records

character

include

not

need

on

a record

and

the

a mask.

ABIbCD

two

of

be in

is

accomplished in a forward

record.

all previous sectors are

selection

as in

mode.

not

read during a search

record

the

that

positions.

their

anyone

the

entire record.

to

that

the

positions

blank

cannot

For

stop

positions

the

field.

the

The

function

this

function

(M)

the

current

If

the

found;

reenter

does

record (6),

line. However, if

mask,

or

be

contiguous. contains

search mask.

that

be

example,

and

the

search mask

on

the

of

the

Any

of

third

position

records

from

error

to

previous record

record

entire

data

the

search

the

search mask.

on

not

match

error

the

search

are identified by

The

specifica-

positions

more

are

used successful-

first record

field and CD

the

contained

the

occur.

same mask,

content

the stops

is

positions

The

mask

The

an

exact

The

blank

not

included

if a certain

256

of

the

direction,

not

checked.

read index

any

other

buffer

and

set

has

stops

and

REC

and

the

mask,

appears

data

in

and

that

in

the

SMITH was was initiated, it

SMITHSON (with SMITH in positions 1

a

match

encountered

If

the

displayed,

operation

the

if

To

reduce ping a search the

mask, it is suggested

fields

keyed

is

if

the

machine

SMITH.

machine

record can be

that

stops

the

operator

from

the

or

eliminate on

contain

record

in positions 1

possible

no blanks.

that

encountered

the

search

should

address

found.

the

that

where

possibility

does

the

through

the

machine may find

SMITHSON

with

the

continue

the

search

of

not

completely

search be

Search on Sequential Content

Search

on

sequential

but

is

faster. Search

just

as search

tent

only

when

the

search fields are in ascending

each succeeding record

preceding record). See Figure which can and

Having searching because

Search or

backward when the

If a search fails is

displayed. Failure

the

meet a search failure, a search the to

the

data

be

which

characters

the

search fields in ascending

on

sequential

direction;

the

search

record being searched.

record

is

in

the

requirement

same search mask.

index

track

set.

content

the

used

to

of

is

started

to

find

the

data

in

content

on

records in a

determine have higher values

the

content

to

order

is

similar

sequential

does. Use search

data

order

must

have a higher value

13

for

character

skipping

therefore,

at

the

find a record can

set

of

ascending

on

To

of

operates

a record can

a higher address

record

sought,

if

one

content

do

this

to

search

content

set

the

order

records.

or

more

order.

may

operations,

through

5 and

the

search

through

wrong

the

to

on

are arranged so

(the search field

collating

than

in

either

occur

be

5)

to

before

record

search

content

stopped

machine

match

performed

search

on

content,

requires a mask

sequential con-

than

sequence

values

others.

permits

a search (S)

records

Therefore,

faster

a forward

be

located

than

that

even

do

initiated

first

return

the

entire

be

it

to

see

stop-

on

that of

the

of

error

though

not

after

using

Occasionally,

length,

pf

the

This

is

keyed, searching that

the

of

the

tion

)

the

of

record

when

the

search

may

field in

the

record being displayed

because

and

record

a field

the

compares

for

the

data

blank positions

that

will

could

the

operator

searching

stop

machine

the

mask

that

in

not

satisfy

desires.

on

fields

on

a record in

takes

to matches the

mask

be

checked.)

the

mask even

For

that

are variable

which a portion

matches

the

mask, in

records in

the

identify

example, if a mask

the

mask.

(Remember

the

Therefore,

though

the

mask.

positions

data

set

positions

a por-

it

is

not

of

Select search enter

or

update

displayed

and

on

sequential

mode.

the

3741

content

When a

is

in

Operation Modes and Considerations 17

match

update

from

occurs,

mode.

the

read

the

index, record

is

EBCDIC

Order in

the

Sequence

1

(lowest)

2' 3

4 5 6 7 8 9 10 $ 11 12 13 ; 14 15 16

17

18 % 19

20 21 22 23 24 25

26

27

28

29

30 C

31

32 E

33 34 35 36 37 38 39 40 41 42 0 43 44 45 46 47 S 48

49 50 51 52 53 54 55 56 57 58 59

60 61 62 7 63 64

(highest)

Figure 13.

Collating Sequence

Character

81ank

¢

<

(

+

I

&

!

*

)

1

-(minus)

/

-

(underscore)1

>

?

:

#

@

(apostrophe)

=

"

A

8 0 F

G

H I

J

K

L

M

N

P

Q

R

\

T

U

V

W

X

Y

Z

0 1 2 3 4 5 6

8 9

Collating Sequence

Corresponding

Hexadecimal Number

40

4A 48 4C 40 4E 4F

50 5A 58 5C 50 5E 5F 60 61 68 6C 60

6E 6F 7A 78 7C 70

7E 7F C1 C2 C3 C4 C5 C6 C7 C8 C9

01 02 03 04 05 06 07 08 09 EO E2 E3 E4 E5

E6 E7 E8 E9 FO F1 F2 F3 F4

F5 F6 F7 F8 F9

Occasionally, when searching on fields

length,

the

search

may

stop

on

a record

of

the

field

in

the

record being displayed matches

This

is

because

keyed, and compares searching for that

the

of

the

record

tion

of

a field could satisfy

the

record SMITH was keyed in positions 1 was initiated, it SMITHSON (with SMITH a

match

encountered If

the

machine

played,

the

proper

operator initiate

to

the

see if

To reduce or eliminate ping a search the

mask, it fields

that

the

machine

the

data

that

blank positions

that

will

the

operator

is

possible

if

the

mach ine

SMITH.

stops

the

operator

can backspace a few records

record can be

should

perform a return

search

content

the

record can be

on

a record

is

suggested

contain no blanks.

takes

the

mask

to

records

matches

in

the

not

be checked.) Therefore, a por-

the

desires.

the

mask identify

mask even

For

through

that

the

machine may find

in

positions 1 through 5)

encountered

SM

search with

found,

If it

to

function

,using

found.

the

possibility

that

does

not

that

the

search be performed

Field Totals Mode (F)

Field

totals

can be used

times referred

that

require totals.

to

as

"hash

The

for

batch

totals",

3741 has

auditing, a process some-

or

two

capability: online and offline.

The

online field from records while entering or

verify mode.

obtain

totals

or

verified.

totals

feature

The

offline field

from records

can be used

the

records

that

have been

totals

HEXADECIMAL DATA

The

HEX key provides a

256

EBCDIC characters

are:

0,1,2,3,4,5,6, characters are two

hex

digits. Hexadecimal

entered

method

of

into a data

7,

8,

9,

A, B, C,

by pressing H

data

is

record. Valid hex digits

manner. HEX can also be used like a keypunch are sometimes be keyed

machine

different

in

a certain

except

from

order.

that

the

keypunch

characters

that

are variable

in

which a

portion

the

mask,

in

the

positions

in

the

data

set

mask.

(Remember

the

positions

though

it

is

example, if a mask

5 and

the

search

to

ITHSON

the

wrong record dis-

cannot

index

the

of

the

completely

for

other

kinds

in

feature

entering

0,

EX

and

verified in

multipunch

before

to

be

found,

function

same mask

machine stop-

match

applications

of

field

to

obtain

enter,

update,

is used

entered,

any

updated,

of

E, F. Hex

then

keying

the

same

key

see if

and'

totals

the

combined

and

they

mask.

not

of

be

it

the

on

to

on

a

must

(

18

MUltipunch

Operations

Example: Assume

the

display looks like this:

HEX can on punch

The with valid

11

the

(0

a

numeric

12

the

o Punch:

E key

9. If

then

a zero

twice

be

used

card

keypunch

to

hexadeci mal conversions.

important

11,12,

and

for

overpunching

Punch:

0 key

through

Punch:

C key and

0,

For

or

the

9).

field indicates a negative value.

For

and

then

the

numeric

press

the

do

not

use HEX, just press

with

a zero

resulting in no change

to

perform

machines. See

multipunch

0 punch.

numerics 0

the

11

punch,

dash

(-)

The

11

overpunch in

the

12

punch,

then

press

the

the 0 punch,

the

numeric

is

a 1,

the

6 key and

on a punched

then

the

equivalent

Appendix B for

operations

The

following

first press H EX,

key,

first press HEX,

numeric

first press H EX,

key procedure

the

from

are

through

and

then

the

(0

if

the

numeric

1 key. I f

the

0 key. (Overscoring a

card

punches

a single zero

of

mUltipunch

card

overpunching

procedures

9.

then

the

numeric

units position

then

through

is

to

9).

then

press

is 2 through

press HEX,

the

numeric

the

same hole

punch.

are

press

key

of

press

the

.....

The

first hex digit

is

a

O.

The

Assume

is

The

is

another

first

8 + 4 + 2 =

-

...

_

...

is

8 + 4 + 1 = 0

hexadecimal value

display looks like this:

..

...

_

.....

......

.....

......

hex

digit

E.

_

The

.....

...

.....

......

is

8 + 4 + 1 = 0

hexadecimal value

is

8

4

hex

8 4

8

4

2

and

DO.

and

the

is

second

hex

DE.

hex digit

~

)

Hexadecimal Display

When

hex

data

is

keyed

or

displayed,

represents displayable characters such as an A B C ...

o 1 2 3 ... When

character, a hexadecimal display the

eight

on) looks like this:

bit

code

the

for

hex

the

data

data.

keyed

not

is

not

is

provided

The

basic display

all

of

the

a displayable

that

represents

H

Other

lines are

the

EBCDIC code.

Bit Position Bit Position

0-

1

-

23-

4-

5-

6-

7-

----

added

to

the

HEX Value

-8

-4

-2

-1

-8

-4

-2

-1

display for each

of

Add

these

to

get

the

Only

add

gether

for

}

ed.

Add

these values

to

get

the Only gether ed.

add

for

}

bit

that

values

first hex digit.

those

values to-

the

I ines display-

second

those

values to-

the

I ines display-

data

or

(no

bits

is

on

together

hex digit.

DELETED

A record the of sector

If a record record as

delete can be preserved character character

and

in

delete a

acter

Station Operator's Guide,

When

mark address displayed in for must

To

record record

Index

press REC ADV.

RECORDS

is

identified as

data

address

the

record. This address

of

the

then

record

of

the

to

see if

mark

a 0 in

use

change a

must and

mode,

mark

a disk)

is

deleted,

deleted.

record,

or

D.

To

delete

of

the

data

press NUM

and

data

record

3741 reads a record, it

the

indicates

the

status

the

first position

the 6 error

deleted be

rewritten.

press REC ADV.

press FUNCT

either

deleted

which precedes

mark

not

part

of

the

data

address

Depending

the

first

automatically

record, press

SHIFT

automatically

record

to

record

on

character

a record

with

a

GA21-9131.

is a deleted

the

record

line. Since

of

the

identify

to a non-deleted

To

do

To

SEL

Operation Modes and Considerations

or

non-deleted

the

first

(one

of

two

data

and

is

mark

the

procedure

of

the

data

replaced

and

FUNCT

DELETE REC.

replace

0,

see

examines

is

the

data

deleted

this, key a

rewrite a record in

lower, press

with

preserve

SE L lower

the

IBM

3741 Data

the

record. If

deleted,

3741 does

record,

records.

character

in each

not

displayed.

identifies

used

record

the

first

To

first char-

data

address

the

data

a 6

error

not

the

operator

record,

change

M,

to the

and

by

the

to

is

check

the

then

19

Notes:

1.

In

the

Index

mode, a record

change

is

keyed

to

the

a D

in

the

first

position

record.

the

3747,

2. When record, first

address

position with to a attached preserving

If

see

Station Programming Reference Manual,

for

Diskette General

it

position

mark

in

an

error

be

processed

3742,

or

the

diskettes

IBM

3741 Models 3 and 4 Programmable Work

information more

3540,

examines

the

if a

3741,

the

information,

both

in

the

data

identifies a

data

condition.

by

other

data

set

the

procedure

first

data

are processed

on

deleted

Information

record

is

rewritten

record.

but

the

or

any

other

the

data

record for a

deleted

is

not

Therefore,

than

a 3741 Model 1

is

used as

for

character

by

records

see

Control

Manual,

That

record

a 3741 Model 3 or

even if

is,

the

record

is

not a deleted

system

reads a

address

record,

a D, a

input

deleting records

should

mark

D.

If

the

but

the

halt

will

if

the

diskettes

from a

not

be used.

GA21-9194,

requirements.

Records

in

GA21-9182.

or

directly

The

no

and

data

first

occur

2,

has

the

are

or

and

4,

Also,

IBM

When a hold non-deleted passing all is record vious record

When deleting a record, record function

Search Mode: Using

blanks

at and If

both

deleted

record

buffer

(next

record

deleted

encountered

is

read

buffer

is

performed.

the

current

the

first manual

the

record

the

search

the

current

record.

advance

sequential record

is

records

during record backspacing,

into

the

buffer

unchanged.

remains

DELETE

record

position.

at

the

operation

and

occurs

read

into encountered.

current

the

contents

unchanged

buffer

The

current

terminates

and a deleted

is

deleted),

the

current

If a

record

buffer

of

the

and

a record advance

REC

during

and

positions

record

buffers

record

the

record

deleted

the

deleted

with

the

record

record,

contain

is

in

record

the

pre-

mode

cursor

buffer

the

by-

Mode

Considerations

Enter Mode: Using

the

current first unchanged.

Update Mode: If,

record

deleted

record

transferred

record previous record

When

D in

content

Verify Mode: When selecting verify

track,

into

manual

is

read

buffer

record

advance

is

encountered

deleting

the

current

in

the

first

the

current

record

position.

will

to

the

for

DELETE

buffer

during

into

the

contain

is

in

the

occurs

the

buffer

a record,

record

current

nondeleted

record

Deleted

REC during

and

positions

The

previous record

update

current

during

is

record

the

current

record

not

the

first

buffer,

record

buffer.

record buffer,

same

update

changed.

"and

buffer

mode

record

character

Records

enter

the

cursor

buffer

selection, a deleted

the

deleted

buffer.

the

in

buffer

mode

remainder

remains

mode

the

data

record.

when

the

If a

is

changed

unchanged.

from

set

mode

at

is

a

record

deleted

the

of

the

is

read

blanks

the

is

to

a

the

index

not

RECORD

With

this

as

shown

BOE 01001

I

To

insert records

performs

for

the

number

deleted

have a D

002.

The

INSERT

feature, below.

Current

Record

Address

01005

an

operation

of

records in

in

position

remainder

FEATURE

you

can insert records

01006

Records

1

2

3

into a data

records

the

001 and a \ (inverse slash)

of

a

which

space

the

A A

set,

creates

to

be

created.

record

the

record

space in

inserted.

The

is

blank.

01005

within a data

EOD

10026

to

be inserted

insert

function

the

data

The

3741

deleted

records

in

position

set

EOE 15026

1

set

puts

If verify

the

non-deleted

I n

20

mode

currently

either

is

selected

displayed record

record

is

case,

the

from

into

record

update

or

is a deleted

the

current

buffer

is

verify

one,

record

blanked.

mode

the

buffer.

and

If

you

want

to

with sector

in

sectors

To create space from the

data

as

the

example

05,

05

through

the

current

set.

The

number

of

creating space for five records:

insert five records

the

3741 would

09.

in

the

data

record address

3741 moves these records as many sectors

of

records

to

on

track

put

five deleted records

set,

the

3741 moves

through

be inserted (up

01

the

last record

to

beginning

the

records

99). An

in

Update Mode

The

machine searches

Then

it reads records

rewrites these records

all

the

records,

fied disk address for

Verify

Mode

the

3741 adds deleted records

to

the

last record in

in

groups starting

at

their

new addresses.

the

number

the

at

this address· and

After at

of

records specified.

data

the

set.

moving

speci·

Last Record

in

Data

Set

10020

--------4.~~

1

0025~Last

in

data

after move

BOE

01001

Current

Record Address

01005

[

I

L...-----+---l

101005

0\0\

Space filled with

deleted records.

When using space between label.

That

have

40

sectors available, (from

set, an error occurs.

If

all

of

the

deleted records will be ignored when processing data. If

have deleted records,

error

which

Therefore, if enough space was

of

records not be used at

some

get

to

the

to

search for

other

0\

the

record insert

EOO

and

is, if

you

want

space created

you

the

3741 displays with each deleted record.

be inserted,

deleted record (6) error. Search

the

time.

--------'

010091

0 \ 0 \

function,

EOE

specified

to

insert

is

not

must

reset

not

you

will realize it

0\

when records will be inserted

there

50

E00

to

used,

the

specified for

must

in

the

data

records,

EOE)

in

remaining

deleted record (6)

when

on

content

be enough

set

but

only

the

data

the

number

you

do

record

set

you

can

The

Record Insert mode

is

in

the Verify mode. The 3741

mode before

Read Index Mode

The

3741 moves all records

mode. Then

address.

Search Mode

The

action

was

in

above.

When with deleted records, of

the

The

machine goes

you

were deleted record (6) error, goes hold buffer.

the

Record Insert mode

the

machine adds deleted records

taken

by

prior

to

selecting Search mode. See

all

the

records have been moved and

first record

in

previously.

the

of

to

the

update

cannot

machine

3741 returns

space created.

The

be selected while

must

be placed

is

selected.

in

the

data

set as if

depends

to

mode

regardless

machine also displays a

to

program

in

at

on

the

one

of

the

space filled

the

disk address

of

0,

and blanks

the

in

Update

the

mode

the

3741

BOE

it

mode

the

Record Insert Mode Characteristics

Enter Mode

No

records are moved create a space within want

to

add later. Deleted records are added starting

the

current

specified.

disk address

in

your

for

this

data

mode

the

set for records

number

but

it allows

of

records

you

to

might

at

Operation

Modes

and

Considerations

21

ADDING RECORDS

operations,

Verify counts

can indicate are missing have

to

be

added Records become been keyed.

The the (by using search position in last record in presses REC data added

Some sensitive. tive with

available

easiest

end

of

can

to

data

data,

the

may

way

the

be

the

sets

To

the

Disk

may

be

somewhere

also have

after

to

batch.

EOD

data

the

data

ADV

entered.

data

may

handle

following

Copy

batch

add

to

set.

TO

A BATCH

control

that

records are missing. Records

added

to

the

records To operation)

set. When

set

get

to

The

consist

addition

procedure

feature.

totals, and

to

the

end of

the

in

the

middle

be

added

to a batch

batch

to

which

to

a batch

do

this,

the

operator

to

the

end

the

search

is

displayed.

the

missing records can

of

records

of

The

that

records

can be used

to

3747

batch,

of

the

if

they

belong has

is

to

add searches

of

the

is

finished, operator

then

are

sequence

on

record

or

batch.

they

them

data

where

be

3741 's

that

may

the then

sensi-

to

DATA

RECOVERY

The

most significant recovery

re-establish

data

label

•

The data mode, returned

•

The before

displayed

was pressed.

Recovery

is

a simple

If

the

procedures should assist

the

for

the

set.

The

old EOD address

under

the

operator

set

that

performed

to

operator

return

on

of

the

data

EOD address

data

set

EOD address

following conditions:

inadvertently

contains

at

the

index track.

removed to

index

the

status

data

sets original EOD address, if

set

label modification

is

by

finding

currently

least

the was pressed

line

not

known,

in

determining

the

step

in

data

of

the

partially

is

destroyed

selected a

valid

one

record advance

diskette

when

RETURN

one

last record

data

data,

from

or

before

of

the

of

the

recovery

of

is

to

destroyed

on a data

set selected

the

EOD field.

following

EOD address

the

set

label

of

enter

and

then

disk drive

X R was

TO

INDEX

known,

data

set.

a

Determine

1.

be inserted, according

Insert

2.

into

3.

Insert a scratch

onto

4.

Press FUNCT

5.

6.

Press FUNCT shift address

you

7. Press FUNCT shift

8. When

have been copied

displayed.

Enter

9.

10. Press FUNCT shift

remainder

11. When and

22

the

diskette

the

disk 2 disk drive.

this

diskette)

key, press SEARCH ADDRESS,

of

the

wish

to

key,

and

the

address

the

records

key,

and

of

the

copy

RETURN

proper

address

to

the

from

which records will be copied

diskette

SEL

press COPY.

SEL

press COPY. This

the

is

TO

(the

into

the

lower

and

upper

and

lower, hold

record

after

to

write.

upper,

hold

entered onto

to

records still

complete,

INDEX.

disk 1

be

added.

upper,

is

hold

at

which records

sequence

records wil!

disk drive.

ENTER.

DISK 2 RET TO INDEX.

down

reached, all

except

on

press FUNCT

the

down

step

disk 2

of

the

key

address

the

for

the

copies

onto

data.

be

copied

numeric

in

the

at

numeric

the

records

the

record

numeric

the

disk

SEL

must

which

lower

Procedure 1:

• Modify estimated

• Execute a search EOD record displayed. If as a valid record record, using a higher record data the

Procedure 2:

• If

field in

and perform a search last record as the

When following:

1. Press R

2.

1.

3.

the

EOD field

EOD address.

return

to

estimated

is

not

recognized as a valid record

set, press record backspace until

data

set

is

found.

the

last record

the

data

the

last record

the

last record

Write

Perform a

EC

down

entered

ADV.

the

return

in

the

data

operation

the

displayed record

within

the

data

the

index

track

EOD address. If

content

set

search mask. When

is

known,

label

to

the

on

content

should be displayed.

of

the

data

set

address.

to

index

operation.

set label

and

set

and

EOE address plus

operation

is

examine

but

is

repeat

the

modify

the

found,

with

the

is

recognized

not

the

procedure 1

the

displayed

within

last record in

the

using

search stops,

perform

an

last

the

EOD

one

the

4.

Modify recorded address.

5.

Execute

address.

6.

If valid corrected.

On

occasion, an disk drive before pressing RETURN TO INDEX. When this happens, will

not

is

updated

ed.

The

situation.

BAD

SPOTS

If a record

copy

function

then

manually key

depend

Enter

diskette.

new records and clear itself; if set (see Adding Records to a Batch

the

EOD field in

a search EOD

the

operator

data,

the

operator

there

is

be

correct

is

preceding

on

mode -return

when

the

ON

DISK

cannot

can be used

the

mode

Verify

then

record advance

not,

delete

because

procedures

be read from

the

data

set label

operation

had originally keyed over

records should be examined and

will remove a

the

possibility

the

only

return

to

should also be used

to

copy

bad record.

the

station

to

index and

or

Update

the

record and add it

to

diskette

that

time

index

function

or

written

surrounding

Alternate

is

in

when

continue

mode

- backspace several

to

see if

in

this

validate

currently

from

the

EOD address

that

the

is

onto

methods

the

error

the

problem

to

section).

with

the

address perform·

for

disk,

data

batch

the

and

occurs:

the

EOD

the

this

the

on

wi

data

• For

all

other

modes,

found

record

When

the

no record

appropriate

3741

copy

Follow recovery copying. record

tive

diskette

Seek (3)

A seek

is

defective. When

returns depending persists, all

of

Guide,

a

procedures in the

II

seek

the

diskette

defective.

copy

Data

Station Operator's Guide,

procedures.

the

procedures

when

the

Be

sure

found

error

should

Error

error

occurs

to

the

index

on

the

perform

the disk.

GA21·9131 provides

The

the

error

occurs while copying.

on

which

The

defective

the

error

is

found

operation

in

no

record

to

identify

occurred

be

initialized.

when

the

seek

track

mode

the

appropriate

record read prior

displayed.

error

persists,

to

copy

the

operator's found

error

the

diskette

as being defective.

the

address

error

occurs,

or

remains

of

operation.

copy

GA21·9131

within

perform

data.

guide

occurs on

which

that

identifies a

the

When

the

operation

to

for

3741

IBM 3741 Data Station Operator's

copy

procedures.

operator's

the

diskette

guide for

seek

error

Be

occurred

should

recovery

sure

to

as being

be initialized.

the

The

IBM

provides

error

while

The

data seek

to

Follow

identify

no

the

no

defec·

track

either

set error

copy

the

when

The

following are recovery procedures

3,4,

and

errors 2,

No Record

A no record found identifies

• If

•

the

error

mode,

the

error

update

mode,

key

space

For

verify

found

error

not

the

The

operator

of

the

current

displayed

verified.

current

5 persist.

Found

(2)

Error

error

occurs

location

occurs

display

occurs

was pressed remains displayed.

mode,

after

of

a record

when

is

blank.

when

the

record displayed

the

record

occurred

can reset

is

the

record being verified- and displayed. '

the

record, and press R

pressing R

to

follow

when

the

address

on

disk

is

defective.

record advancing in

record backspacing in

when

the

on

which

the

no

to

be verified

error,

EC

complete

ADV

EC

is

ADV.

the

record just

verification

The

when

disk

that

update

enter

or

record back·

record

Disk Read (4) Error

error

A disk read

the

entire record read

which

the

portion persists be performed

Note:

occurred

record being verified can reset and

read

If you can correct

(5) occurs,

it should be read

For

then

error

or

after

is

the

press R

the

occurs because a

read

error

all

of

the

being reset several

to

try

verify

mode,

the

EC

occurred

identify

data

and press record advance. If no

the

record has been

properly.

is

in error. However,

occurred

record

and

record

and

ADV.

is

then

what

is

in

correct

the

record

to

be v.erified,

displayed.

complete

The displayed.

data

is

portion

displayed even error.

times,

the

verification

record

incorrect

written

of

If

the

following can

error.

on

which

not

Therefore,

on

which

in

to

disk

the

record

though

read

the

of

the

record,

correctly

record,

error

read

current

operator record

the

write

or

on

a

error

and

Operation Modes and Considerations

23

If a write

the

perform a delete

operation

the

If record operation

then

and which

sector

end

the

delete

cannot

manually

sector

the

error

does

is

probablY defective. Reset

record

is

successful (no

of

the

data

record

be

added

can be used

key

address

error

occurred.

Disk Write (5) Error

write

error

A correctly. record

(no

ful

occurs

When a

operation.

write

error),

set.

If

the

delete

record

cannot

copy

operation

and

then

track

and

on which

be

added

can be used

manually key

sector

address

the

error

initialized.

occur

operation.

set.

operation

to

copy

in

the

record.

on

the

external label

when

write

error

If

the

delete

add

the

operation

to

in

the

on

occurred.

after

pressing record advance,

the

write

If

the

delete

write

error), add

is

not

successful,

the

end

of

the

data

the

surrounding

Be

sure

to

of

the

The

diskette

a record

is

should

not

written

persists, perform a

record

operation

record

to

the

end

is

not

successful,

the

end

of

the

data

to

copy

the

surrounding

record.

the

The

Be

sure

external label

diskette

should

the

or

set,

data

write

diskette

be

of

or

set,

to

of

error

and

record

to

if

the

copy

and

the

track

on

initialized.

on

disk

delete

is

success-

the

data

if

the

data

write

the

diskette

be

CE MODE

CE

mode

is

used

by

the troubleshooting describe points

how

out

Pressing FUNCT machine in positions

how

38,

the

this

it

CE

39

the

equipment.

mode is

entered

SEL

mode.

and

40.

Pressing RESET several index

mode

with

the

machine leaves CE 3741 may The

indicator used

should be checked

CE

when

be

changed and

mode

field

CE

may

of

the

mode

and

modify

data

was selected.

customer

works

and

lower,

NUM

The

times

returns

label from

mode,

the

therefore

the

set

label for

corrected

engineer when

This manual does

or

how

it

is

used

how

to

get

out

shift, and C

status

line displays CER

the

machine

sector

08

displayed.

program

buffers

should be

EOD field and

the

data

Therefore,

if in error.

testing

not

but

merely

of

the

puts

the

to

of

checked.

the

verify

set

being

those

or

mode.

in

the

After

the

fields

24

Chapter 3. Program

Information

Programs similar

can

be

written control are

buffer can selecting)

grams

separate

contains

program, modifying a program,

Guide,

The

bered 1 through 9 and selects

number

position

gram

Program

program.

is through 9 and

the

keyed.

(as

be

stored

are

from

only

selecting a

GA21-9131.

3741

programs

is

12. When

buffer

buffer a is

automatically

to

for

use

record

format

Programs are

data

is

keyed

on

the

or

stored

directly

stored

on

the

data

programs).

provides

displayed

When

storage

by

operating

number a is

the selected

A)

are

those

disk,

these

a single

used

on

the

and

first

in

enter

disk

(for

they

or

on a program

For

program,

see IBM

for

A. The-

numbers.

to

the

operator

displayed

character

machine

and

filled

with

on

the

IBM

029 Card

3741. A

assist

keyed

later

into a program

can

information

displaying a program,

3741

up

operator

under

is

turned

all

program

the

operator

into

the

current

mode)

from

which

program

be

stored

disk (a

loading

buffer.

in a

on

Data Station Operator's

to

ten

programs,

loads

The

selected

in

the

status

manual

in

program N's

the

status

all

alpha

on,

program

buffers

(numeric

control

Punch

is

written

as

records

record

they

and

If pro-

data

disk

that

loading

or

num-

programs

program

line

at

pro-

line.

field

buffer

(1

field).

set

a

and

to

a

A field

definition

indicates

definition

played position

the definition equal characters,

Figure

The

last field that the E character. containing occurs the the tion

000

the

position

where

character

in

the

status

long,

appropriate

character

the

length

continuation

14.

end

of

program

definition

are 128

following field

position

on

record

characters

an E

if

the

AUTO

definition

the

3741. REC

on

is

at

is

000 causes a

characters

the

character

each

field in

of

line.) If a field

the

field

continuation

and

of

the

character

or

When

character

REC

character

blanked,

disk.

defines

the

record

the

field being

definition

the

continuation

field).

continuation

the

For

characters,

(E)

long

for

cursor

in

the

ADV

is

in

the

status

is

set

and

the

ADV

should

Keying

truncation

the

program, a record

cursor

data

the

type

of

field

begins.

processed

is

more

character

characters

a list

of

and

their

normally

character.

3741

reaches a position

on.

If

this

line

to

E,

the

position

be pressed

when

(T)

(The

is

than

one

is

followed (the

characters

field

definition

meanings,

follows

Programs

do

not

require

switch

are

changed:

field

is

to

the

cursor

error.

and

field

dis-

by

field

must

see

the

advance

is

off,

continua-

set

to

write

PROGRAM CODING

A

program

A

program

•

Position

•

Type

•

Length

Last

•

A

program

continuation

defines defines

at

which

of

each

of

each

position

consists

characters,

the the:

field in

field.

of

the

each

of

format

field in a

the

record.

field

and

of

the

record.

definition

the

end

record

characters,

of

program

for

starts.

the

operator.

field

character.

Program Field

Descriptions

Field Continuation Characters

Field

continuation character alpha) character

must

acters

If desired, field

within

and

the

plus

equal

the

are: dash

any

particular

characters

are

used

length

of

the

number

field

length).

(-)

for

continuation

field.

to

indicate

the

of

numeric

field

follow

a field

the

shift

(the

field continuation The

field

continuation

and

period

characters

definition (numeric definition

characters

(.)

can

be

or

char-

for

alpha.

intermixed

Program

Information

25

Field Definition

Characters

Keyboard

Shift

Meaning

N

A

B

J

R

D*

U*

S*

K*

v

w

X

y

z

Numeric

Alpha

applicable

Not Numeric

Numeric Alpha Numeric Alpha Numeric Alpha Numeric Alpha

Numeric

Alpha

Numeric field Alphabetic field Unconditionally bypass

the

field Right adjust numeric field with blank fill characters Right adjust numeric field with zero Right adjust alphameric field

with

fill

characters

blank fill characters Automatically duplicates Automatically

duplicates Automatically skips Automatically skips

Bypass numeric field during verify mode only Bypass alphabetic field during verify mode

only

Bypass right adjust numeric field with zero fill characters during verify

mode

only

Bypass right-adjust numeric field with blank fill characters during

verify mode only

Bypass right-adjust alpha field with blank fill characters during verify mode

only

H

C

F*

G*

L*

M*

Any

fields definition

character followed

by

1,2,

or

3

Any B field followed

4, 5,

or

8,

or

are

6

9

automatic

by Any B field followed

by

7,

- (dash)

. (period)

E

*These

fields

Numeric Numeric Numeric Numeric Numeric Numeric Not applicable

Not

applicable

Not applicable

Numeric

Alpha

Not

applicable

only

with

the

AUTO

Self-check, modulus 10 field

11

Self-check, modulus Self-check,

~odulus

Self-check, modulus Self-check, modulus Self-check, modulus

Field

totals

entry

Field

totals

readout field (for offline field totals)

totals

Field

readout and reset field

Continuation character

field 10 skip field 11

skip field 10 duplicating field 11

duplicating field

for

numeric fields } Continuation

Continuation character for alphameric fields mixed

Indicates

OUP/SKIP

on.

the

end

of

the

program

characters can be

in

a field.

Figure 14. Field Definition Characters

26

Right

Adjust

Manual Numeric Fields

The

numeric

tion

character.

the

field length.

field

length.

is

required.

ridden

field

field. The N

If

the

Any

by

using

the

definition

is

followed

The

number

The N plus

field

position

alpha

is

in a

shift

only

character,

by

of

dashes

the

dashes

one

position,

numeric

key.

N,

defines a manual

the

dash

(-)

required

must

equal only

field

can

continua-

depends

the

be

over-

on

N

Right entered there

12345

is

pressed,

~~~~~.

would adjust

If a

manual

the

V field definition when field in the

3741

in

the

verify

numeric

definition

character.

mode,

data

record

will

bypass

field

does

not

character

instead

The V indicates

the

corresponding

does

not

have

the

field.

have

to

be

of

the the manual

be

verified

verified, use N field

3741

that,

numeric

and

adjust

The

J field

adjust are

characters data. acters character

Manual Alphabetic Fields

V

indicates

corresponding

The

alphabetic manual (.)

continuation depends must

equal

only

\he A is

can

be

overridden

alphabetic

on

field

character.

the

length

the

field

required.

definition

field.

of

length.

Any

by

using

character,

The A is

The

the

field.

If

the

position

the

numeric

followed

number

The

field

in

A,

defines

by

of

periods

A plus

is

only

an

alphabetic

shift

key.

the

the one

a

period

required periods

position

field

have

to

The

R field adjust right

adjust

field

definition

character.

verify

If a

manual

use

the definition when

field in

the

3741

alphabetic

W field

character.

in verify

the

data

will

definition

mode,

record

bypass

field

does

not

character

The W indicates

the

corresponding

does

not

have

the

field.

have

instead

to

the

manual

to

be verified

to

of

be

verified,

the

3741

alphabetic

A field

that,

and

data

record

bypass

The

I field adjust alphabetic use

the

definition

Unconditional Bypass Fields

The

unconditional

causes

the

3741

by

either

dashes

The

number

on

the

length

tion

characters

totals

Field by

using

the

a

4,

5,

or 6 indicates

B

followed

and

be

used

by

reset field. Again,

to

fill

information

6.

I

)

Offline Field Totals.

bypass

to

bypass

(-)

of

continuation

of

the

must

readout

B field

a 7, 8,

out

the

on

programming

field

the

or

periods

characters

bypass

field.

be

equal

to

and

readout/reset

definition

a field

totals

or 9 indicates

either

continuation

remainder

field

definition

field.

The

(.)

continuation

The

B plus

the

length

fields

character.

readout

a field

of

the

totals

character,

B can

be

followed

B,

characters.

required

field.

the

of

the

are

A B

followed

field,

totals

character

For

depends

continua-

field.

indicated

and

a

readout

can

complete

fields, see Chapter

by

when

in

the

3741

will

Duplicate Fields

Fields can

that

the the

previous when DUP/SKIP

or

numeric

Duplicate

cate

field

definition

and

the

duplicate

(D

or

period)

Fields

adjust

fields allow

into a data

is

a right

adjust

is

keyed

the

field

After

look like

field

definition

fields

must

definition

field

that

If

a

numeric

does

not

instead

to

the

right

be

verified

definition

field

that

field

The X indicates

mode,

the

does

the

field.

definition

field

that

right

Z field

definition

character.

in

verify

mode,

data

record

bypass

be

programmed

field in

record.

the

AUTO

switch

field

fields

definition

character

U field

field.

U)

by

the

to

complete

data

record.

field

into

the

field. Before

would

the

right

adjust

this:

DATA characters

be

at

least

character

has

blank are placed in right

adjust

have

to

be

of

the

J field

3741

that,

adjust

and

the

character

has

zeros

for

does

not

have

character

instead

corresponding not

have

to

character

has

blanks

adjust

field

character

The Z indicates

the

corresponding

does

not

the

field.

the

current

The

field is

DUP/SKIP

is

off,

the

depending

can

be

alphabetic characters defines a numeric

definition

Follow

character

the

appropriate

the

to

be

right

adjusted

For

example,

that

is

10

positions

the

look

like

this:

key

is

pressed,

...

~~~~~12345.

are J, R,

two

characters

defines a numeric

fill

characters.

front

of

the

field

with

blank

verified, use

definition

when

field in

3741

in verify

the

will

the

character.

data

bypass

defines a numeric

fill

characters.

to

be

verified, use

of

the

R field

to

the

3741

that,

right

adjust

be

for

does

verified

defines

fill

and

an

characters.

not

have

instead

to

the right

have

to

be

verified

as

duplicate

record

can

fields.

be

duplicated

switch

is

on.

field

appears

on

the

field

definition

or

numeric.

are D and

duplicate

defines

field

definition

continuation

duplicate

field.

when

assume

that

long

right

adjust

DATA

...

12345-

the

field

The

right

I,

X,

V,

Z.

long.

right

Fill

characters

right

adjust

fill

V field

definition

mode,

record

does

the

field.

right

If a

numeric

the

definition

when

field in

the

3741

alphabetic

If an

to

be

verified,

of

the

I field

3741

that,

adjust

and

This

duplicated

automatically

If

the

AUTO

as a

manual

character.

The

U.

The

D field

field

an

alphabetic

character

and

key

Right

char-

The

the

not

X

in

the

will

right

field

the

means

from

alpha

dupli-

used

(dash

Program

Information

27

An

additional

tion

is

data

to

field

in

data

in

as

the

field

be

duplicated

is

required

data

in duplicate with

the loaded initiated

auxiliary

be

duplicated

Skip Fields

Fields

can

3741

will fill

blanks

fields are automatically AUTO

manual

definition

Sand

K.

skip

field alphabetic character character

Self-Check Fields

duplicate

available.

be

duplicated

the

record

the

program

in

the from

is

that,

the

program

fields

duplicate

into

the

by

pressing NUM SH I

duplication

into

be

programmed

the

and

then

checked

when

DUP/SKIP

alpha

or

character. The S field and

the

skip field.

used (S

(dash

function

For

the

into

is

obtained

buffer

current

program

for

each

buffer

in

the

record. Program

data

just

buffer.

The

function

certain

field

programmed

go

to

the

for

blanks. The

AUTO

switch

numeric

Skip

definition

K field

Follow

or

K)

by

or

period)

called auxiliary duplica-

auxiliary

the

must

record.

be

current

from

buffer

field

in

duplicate

programmed

program

be

in

the

More

than

4 if desired. All

to

be

duplicated,

the

same positions as

buffer 4 is

as

if a program were being

auxiliary

records,

as

skip

duplicate

FT

and

DUP.

is

useful

when

such

as

fields. This means

as a skip field

In

verify

skip

field

DUP/SKIP

is

off,

field

depending

field

is

the

field

definition

on. appears

on

character

definition

the

to

character

the

skip

appropriate

complete

field

the

function,

the

duplicate

buffer

4.

The

same

positions

one

field can

that

the

loaded

function

is

The

data

is

to

header

records.

the

with

mode,

skip

is

skipped

If

the

as a.

the

field

characters

are

defines a numeric-

defines

an

definition continuation field.

The

Land

M field

automatic

11

, respectively.

For

Check Feature.

Creating

There based follows

duplicate

more

information

and

are

two

on

responsibility

the

installations,

to

make

up

system,

on

as

The

lead for every

an

operator

the

disk,

many

as 1898 programs.

second operator,

operator person keys all makes copies

Each

operator approach; were

the

prepared

Centrally prepared

ing existing programs

definition

Storing

basic

approaches

procedure

where

each

and

maintain

rather

than

basic

approach

or

system

in

of

the

of

the

then

has a

only

difference

centrally.

program

self-check fields

on

Programs

used

can

the

programs

master

or

program disk. Copies are

operator.

noted program disk

on

The

the

effective

external

is

the

latest

label,

characters

define

for

numeric

modulus

self-check, see Chapter 9. Self-

to

creating programs,

for

creation.

in

operator

program cards. With simply program

is

that

engineer

installation. Here

program disk

program

disks

adding

then date

of

thus

The

first

approach

many

of

has

today's

the

card

responsibility

the

key

and

maintain

cards. One disk can hold

of

having a supervisor,

create

all

of

the

responsible

for

the

installation,

for

all

operators.

disk, as in

is

that

the

are

new

ones

made

and

the

program disk can be

indicating

the

program

maintained

to

the

issued

whether

first

master

to

version.

10

and

punch

3741

programs

then

disks

by

chang-

each

the

Self-check fields provide a entries

in

numeric

check

digit. fields are H, C, F, G, characters

are

DUP/SKIP

The

Hand

C field

numeric

self-check fields

The

automatic

must

fields

field

definition

L,

be

on).

definition

respectively.

The F and

numeric

G field

definition

skip

self-check fields

11, respectively. I n verify

these

fields

are

check

computation

feature

installed

skip

field (verified

28

handled

is

installed. If

on

the

3741,

being

for

as

the the

blanks).

method

that

for

checking

contain a precomputed

characters

and

M.

The

F, G,

field

definition

characters

for

modulus

characters

for

mode

bypass

performed

self-check fields

modulus

or

field

fields

when feature

are

handled

define

10

define

with

the

self-

for

self-check

L,

and

M

characters{AUTO

manual

and

modulus

11

automatic

10

and

modulus

correct

only

the

self-check

is

not

as an

mode,

the

auto

self-

either

With

programs

can

programs

of

the

on

record address.

Another separate

method

must

be located again.

on

the

addresses,

method

track,

for

Address

Track

Sector

01 0 01 01 0 02 02 02 03 03

02 01

0

02

0

03

0 0 01

02

0

of

program

be organized

The

simplest

disk in

any

and

then

is

to

arrange each

example:

disk

in

some

desired

locate

the

Programs

Accounts Accounts Payroll Payroll

Payroll Accounts Accounts

preparation,

manner

approach

sequence,

record

by

group

of

receivable receivable

payable payable

the

so

that

is

to

key

keep

track

using search

programs

they

the

on

a

I n this

example, gram levels, three

program so on. track,

wants a search and

By

allowance

If,

after

keying

to

on

presses REC ADV. When

the

accounts

starting

in

buffers starting in

arranging each

is

made for

these

load

the

payroll programs,

record address, keys

programs is displayed, and

PROG

LOAD, and keys program selecting

program program

Another

into

program

PROG

LOAD, and keying

is

loaded

into

is

loaded

into

approach

would

as follows:

Address

Track

01 0 01 01 0 02 02

02

02 03 03 03

In

this

example,

the

disk preceding contains typical

Sector

01 02

0

03

0 01

0

02 03

0 0

04

0 01

02

0 0

03

descriptive

header

record

each job has a

the

follows:

PAYROLL

PROGRAMS-EMPLOYEE MASTER, DAILY

TIME, DEDUCTIONS.

receivable

track

01,

group

adding

programs

onto

the

operator

number

buffer

1. By pressing R

program program

be

to

Record

Accounts Accounts Accounts Payroll Payroll Payroll program 2 Payroll Accounts Accounts Accounts

actual

program. A header

information

for

payroll

job

sector

01.

track

02,

of

programs

new

programs.

a disk,

the

operator

in

02

(track)

first

of

the

presses

1.

This loads

the

number

buffer

2.

The

buffer 3 in

organize

the

receivable (header) receivable

receivable (header) program

program

payable (header)

payable

header

record

about

the

programs

has

two

Payroll has

sector

01,and

on a separate

the

operator

performs

001

(sector),

three

payroll

FUNCT

SEL

the

EC

ADV,

2,

the

third

payroll

the

same

program

program program

1

3

program program

recorded

record

programs. A

would

be as

pro-

first

disk

1

2

on

Thus

far,

the

methods have assumed a program disk basic

system

disks

that

For

simplicity, assume an installation has

for all

in

the established to

be

to

reserve

Thus,

approach

are

to

of

the

jobs

installation can have a bypass

for

track 1 (26

recorded.

tracks 2 through

an

operator sired program, load it, and same

diskette.

1.

Insert

diskette.

Search

2.

for a program

contain

to

be

The

second

can insert a

The

procedure

of

creating

for

is

to

include programs

data.

performed

sectors), in

data

73

for

diskette,

proceed

would

(record address

and

storing

each

operator.

on

the

data

which

set

label can be established

programs

on

only

20

3741.

set

label

programs are

The the

programs

Each disk

data.

search

for

the

to

enter

data

on

be as follows:

or

search

other

same

de-

the

on

content).

3. Load program(s).

4.

Press

the

return

to

index

key. (This

1

program

read/write

head

data

to

set.)

the

index

track,

returns

the

label

the

for

the

2

5.

Press

the

next would the

disk.)

6. Select a the

first

the

data

I n

summary,

and an

error

a

diskette

1.

in

Create a programs

and

field

record advance key. (This

sector

on

the

index

track,

be

the

data

set

label

for

mode. sector

rekeying programs as prone one

(The

read/write

of

the

station

is

placed

practice. Programs

of

the

following ways:

separate

routinely

totals

program

used

operations.

data

portion

in

the

they

diskette

for

key

increments

which

the

data

head

of

selected

are used

should

that

entry,

in

this

portion

is

positioned

the

disk,

mode.)

is

inefficient

be

stored

contains

verification,

to

case

of

at

and

on

all

Messages can also be included in

find

the

payroll program using

performs a Search

then

presses REC ADV. This causes

search

for

the

on

Payroll

Content,

header presses REC ADV, selects programs as

needed

for

that

the

this

keys

record.

program

job.

header

approach,

in

the

word

the

data

The

operator

load,

and

program.

the

operator

Payroll,

station

then

loads as

To

to

many

2.

Record used

for

the

programs

recording

on

and

the

same

verifying

Program

diskette

data.

that

Information

is

29

Whichever procedure separate program diskettes) ble

for

the

operator.

1.

Put

all

program

each

pro~ram

2. Put each program into a separate in

that

data

3.

Put

all program

the

record job's

set. To call a program

the

address

There are many advantages The

most

important

tion

of

program

disks, labeling

set's

exact

of

formats

them

is

adopted

the

Three

common

formats

data

into

set

with a header record.

data

set

set,

include header information

label.

formats

the

is

in

address

of

first program.

to

separate program diskettes.

that

chances for accidental destruc-

are reduced by isolating program

externally

with

ing two-disk procedures into each

the

3741.

(shared diskettes

or

programs must be identifia-

methods

a single

can be used:

data

set. Identify

(payroll, invoicing, etc.)

a single

data

the

first program

for

loading, search

set and

in

each

to

color codes, and build-

job

that

is

converted

to

PROGRAM CHAINING

When records having different

programs

required. Program chaining provides

tically select programs when

record

to

the

different

to

control

next.

Program chaining frees

formats

the

format

the

from manually selecting a new program of

the

record changes. Program chaining can be

forward (when record advancing)

or

backward (when

record backspacing) manner.

Positions 127 and Position

128

a record advance

to

indicate operation when

occurs. These positions have

record

is

the

format

128

used

to

operation

program

changes and a

of

a program are used for chaining.

indicate

the

program

occurs. Position 127

to

select

when

different

needed.

Any

valid program

or

128

of

the chaining are numbers 0 ing

to

program buffer A) for

number

can be placed into positions 127

program. Acceptable characters

through

the

9 and

3741.

are being

changes from

when

of

the

ability

the

to

entered,

records are

to

automa-

one

operator

format

done

in

select when

is

used

a record backspace

to

be filled

hex

FA (correspond-

program

for

program

in

only

is

a

Displaying Programs

The

currently

selected program can

be

displayed by pressing

FUNCT SEL lower and DISPLAY PROG. The program replaces ing

displayed. DISPLAY DATA data

has been performed. ing programs, see

Guide,

the

data

record displayed

to

display program 0 results in

record

to

the

display

the

after

For

more

IBM 3741 Data Station Operator's

GA21-9131.

on

the

screen.

the

.current record being

is

used

to

restore

a display program

information

the

about

Attempt-

current

operation

display-

Changing a Program in a Program Buffer

A program in a program entry.

This

is

usually

placed

in

a program

how

to

change a program

How to Change a Program

buffer

done

buffer

can be changed during

when

a program

is

in

error.

For

that

is

in

a program

that

is in a Storage Area

that

has been

information

buffer,

see

in

IBM 3741 Data Station Operator's Guide, GA21-9131.

data

on

the

Program chaining characters can be field. If programmed field, tion also perform

If program chaining be field this as defining a field their positions defined. field would and 2

occur. This would have a single numeric field (N) were chaining characters as part levels used during offline field

the

program chaining characters are

they

characters

at

least

definition

is

not

when

the

program chaining

one

field

character

done,

the

data

is

used

continuation

chaining characters would be interpreted

totals

chaining

three

would

be

126,

The

added

function.

127,

3741 would

position

to

also cause

and 128 a field

in

length and

accumulators 1 and 2.

occur

for

chaining purposes only. Do

will be

treated

is

being

with

field

character

and

the

chaining characters. If

field

in

addition

For example, if N12 were

interpret

the

appropriate

even

though

and

of

field

totals

part

of

a programmed

part

as

numeric

entered

but

they

function.

totals,

there

between

to

performing

totals

field would be

this

to

be a field

value

in

this field

The

numbers

program chaining

the

intention

the

numbers 1 and 2

not

use program

totals

fields

in

operations.

of

a

continua-

will

must

the

in

totals

to

was

program

1

to

30

Program Chaining Example

The

following

Assume program Program buffer 1

A ................... N

Position 127 contains

chaining character, there- This means fore,

on

the

program in program ed

buffer

1 will

be

used

mat

of

Assume buffer 3 is ing program for controlling

to

be

entered:

A

...............

The 1

is

This means

record backspace occurs,

the

program

buffer 1

(Program buffer 1 contains

the

program

to

control

the

record being back-

spaced

to.

is

an example

that a job

buffer

is

1 controlling

contains

-------------------R ----------

being

of

program chaining.

entered

the

following program:

no~

record backspace,

continue

to

control

the

data record. selected

now

that

selected. Program

S

....

in position 127.

that

in

is

to

be selected.

that

the

format

to

the

for- gram

record advance has occurred

buffer 3 contains

the

N

.......

_

...

~;2

if a This means

program

was used

of

with

the

format

data

occurs,

format

record.

format

The 2 is

has been

record advance occurs, the buffer 2 to the

of

E 3

record has been enter-

and

record advance

the

buffer 3 is

to

of

the

in

entered

program

is

control

program

the

that

program

control

the

position 128.

that

to

the

in

data

record.

128.

after

in

to

be

the

and

program

the

follow-

data

record

after

and

in

program

be selected

format

record.

the

pro-

data

of

Assume buffer 2 is

ing

to

N ......... A

The 3 is

This means

backspace occurs,

gram

is

buffer 3 contains gram control

record being backspaced to.

OPERATOR GUIDANCE

Operator keying records. On operator of program field

the

position. Before contains field length

the the and

now

that

record advance has occurred

selected. Program

program for controlling

be

entered:

•...•.•.•

R .........

in

position 127. Position

that

if

a record chaining character, there-

the

in

program

to

be selected. (Program

that

the

guidance can be used

by

lines 5 and 6. Line 5 can be used

data

entered

slashes (/).

character keyed replaces a slash and current

operator

buffer

the

pro-

was used

format

or a maximum

field. Figure 15 shows

to

of

the

displaying

or a prompting

into

the

data

is

The

guidance lines.

buffer 2 contains

the

D.~3

pro-

3

3741,

information

message field. Line 6 displays

current

keyed

number

of

30

format

fore, the

program buffer be used format

to

assist

operator

on

to

field

into

the

of

slashes

slashes.

the

and

the

of

the

data

record

128

contains

on

record advance,

in

program

2 will

continue

to

control

of

the

data

the

operator

guidance assists

the

last

30

positions

display

up

current

display

the

to

the

field, line 6

is

equal

As

data

is

also placed

with

current

cursor

is

program

follow-

no

to

the

records.

when

the

to

the

keyed,

into

data

Data Lines

Figure

15.

Display

with

Operator

Guidance

Status

Line

Prompting Message

or

Current

Field Line

Data Entered

Current

Program

Information

Program

into

Field

31

Prompting Messages

Loading Prompting Message Records

A

prompting fields. A That

is, corresponding field can can be a Prompting numbered ing

record numbered message program

message record consists

prompting

for

ea~h

be

up

maximum

record

field

in

field

in

the

to a maximum

of

five

message records program is program

record

in

program

buffers

associated

buffer.

in

program

buffer 1 and

with

is

directly

the

program,

prompting

of

prompting

must

2,

4,

the

This means

buffer 2 is

30

be

6,

program in

so

Writing Prompting Message Records

Remember

a

corresponding

The an asterisk

played. message. an asterisk.

first

th~t

character

(*).

The

Follow

Continue

for

each field in a program,

field in

the

prompting

of a prompting

the

asterisk

is a delimiter

with

first field's

entering

the

prompting

subsequent message fields following each field prompting A

prompting

(the

length

message field

message record

of a program

must

be followed

is

buffer).

limited

The

character.

of

prompting

to

must

message

a program.

be a

record. Each message

characters

long.

message records.

stored

in

the

even

8,

and

A. Each

the

prompt-

associated

with

on.

there

must

message record.

message record

and

first field's

must

is

not prompting

message

prompting

with

an asterisk. Each

by

an asterisk.

to

128

characters

asterisks

count

There

lower

the

be

dis-

with

as

be

one

Once a

record program is

placed

6,8,

A) record buffer.

loaded the

prompting

3.

When a

record field

is

Example

Here

is

a

prompting

Source Document

Program

prompting

buffer,

buffer must

and

is

into

program

is

also activated

displayed

an

example

l----20

Company

Viking

Eau Galle

l

NCS, Inc

{ A ................... N .................. A ................... D ......... S ......... E

message record

it can be loaded

into

which

be

an even

the

program

must

be

example,

program

buffer

message

is

selected

if

the

is

and

on

line

of a source

message record

21---40

Name

Address

Stereo

Co

1122 20

Cheese

131411

202019

into a program

the

prompting

numbered

to

which

in

the

number

use,

the

first

5.

document,

that

St

NW

Ave

SW

Ave SE New

is

entered

program

the

prompting

lower

message record

4,

the

mustbe

the

prompting

might

be used.

41--60

City

and

Elba,

Minn

Eau Galle, Wis.

York,

State

into

the

current

buffer.

message record

buffer

(2, 4,

message

numbered

program

in

program

to

which

buffer

message

its

program,

61-70

71-----80

Dup

Skip

NY

The

is

and

If no

prompting an asterisk no

prompting

for

message fields

corresponding

program.

message

the

field.

message

is

relationship

for

a field

The

asterisk

displayed

in

the

prompting

to

the

is

in

order

fields

desired,

enter

needed even

to

keep

record

in

the

though

the

their

Prompting Message

Record

"Company

!

Name"

Address'

City

and

State"

Dup"

Skip"

Or

if

you

didn't

want

Name"

a message for

Address"

City

and

the

State""<

dup

and

skip fields

32

The program could the prompting message record

buffer 6. When program buffer 5

display would look like this:

be

loaded into program buffer 5 and

could

be

loaded into program

is

selected for use, the

When the operator completes the company name field, display would change to:

the

5

A A

COMPANY

NAME

IIIIIIIIIIIIIIIIIIII

As

the operator keys the name of

display looks like this:

A A

COMPANY

VIKING

NAME

STEREOIIIIIII

01001

the

company, the

01001

E R

r

021

VIKING

5

STEREO

CO

N N

01001

~

E R

ADDRESS

IIIIIIIIIIIIIIIIIIII

The operator would now key

This process

reached. When record advance and prompts for company name

When a program

record program field, the DISPLAY FIELD PROG key can be used at any time

to PLAY FIELD PROG key, is

used to return

messages.

will

continue until the end of the record

is

selected,

is

also activated.

field instead of

display the program field. After using

the

machine back

in

the address of the company.

is

pressed, the display changes

to

start the next record.

the

related prompting message

If

it

is

desired

the

current prompting message

the

DISPLAY FIELD

to

display the current

to

displaying prompting

is

the D IS-

NAME

key

Program

Information

33

Chapter 4. Production Statistics

Production for use in job

accounting.

vides

•

Number

•

Number

•

Number including all

COUNTERS

Keystroke

The

keystroke

following, in all

1.

2.

3. R key when used

4.

5. The

that

1. Miskeying

2. When keying characters

The

accumulate

reached,

condition

statistics provide statistics

measurement

three

counters

of

keystrokes.

of

records processed.

of

character-s

characters

Counter

counter

modes

RESET Keystrokes with a pending

dash

(-)

or

check

error.

ing

production

Any

keystroke

or

search.

Any

function

keystroke cause errors. However,

program switch keystroke

keystroke

set

up

the

counter

is

indicated.

counter

numeric

counter

to a total

of

workload,

The

production

to

accumulate

corrected

keyed in field

counts

of

operation.

ampersand

to

restore

statistics

during disk

select keying sequence.

does

hex

data.

field with

to

NUMBERSONL

is

counted.

is

a six-position

of

is

reset

statistics

totals

during verify

every

error

(&)

when used

the

or

field totals. copy,

not

normally

the

following are

other

the

999,999.

to

000,000.

on

data

production

analysis

keystroke,

display

than 0 through

program

Y.

When

of

errors, and

function

on:

mode

correct

condition

offline field totals,

(Each

counter

mode.

except

to

reset a self-

after

count

keystrokes

exceptions:

numeric

non-numeric

that

999,999

No

overflow

pro-

the

display-

9 in a

can

is

Note: If

cords,

is

record batch.

Verify

The of field

numeric

used keystroke to a maximum 065,535,

indicated.

DISPLAYING PRODUCTION STATISTICS

Production

with a

display.

keystroke

count

Record

the

operator

these

records are

deleted

characters

the

counter

count

can exceed

Correction

verify

correction

corrected

correct

to

mode

right-adjust field

override a self-check

counter

it

is

reset

statistic

blank

between

The

record

count

in positions 16-21.

Counter

backspaces

recounted.

is

not

the

Keystroke

keystroke

during

except

when

or

is

a six-position

of

065,535.

to

000,000.

counters

each

counter

count

is

in

positions 9-14, and

Keystroke

and

rekeys previous.re-

Also, when a record

decremented.

number

Counter

when a dash

error.

When

are in

displayed in positions 2-7,

Counter

of

counter

verify

mode

a sign

is

The

counter

the

counter

No overflow

the

first

as in

the

Verify

records

counts

changed

or

verify

the

Keystroke

Therefore,

in

the

number

or

entered

on

ampersand

correction

that

counts

reaches

condition

21

positions

following

verify

correction

Correction

Counter

the

during

a

is

up

is

the

Record

The in in tered verify manual position in

six-position

065,535. 000,000.

34

record

the

enter,

update

into

mode

Counter

counter

update,

mode

the

current

are

counter When No

overflow

are

not

the

counts

the

number

and

verify modes. Record advances

not

counted

record

buffer. Record advances

counted

the

that

counter

if

record.

counts

reaches

condition

performed The

of

unless data has been en-

record

up

to a maximum

065,535,

is

indicated.

records processed

in

from

the

first

counter

is

a

of

it

is

reset

to

The

production

index mode

statistic

or

displayed and

counters

then

mode.

To

display

production

statistic

mode, press FUNCT SEL lower

STAT.

After

the

counters

are displayed,

can be restored by:

• Pressing RESET, which causes displayed. The

reset

to

zero.

• Pressing R, which causes and resets

To

display

the

following

production

the

counters

conditions

the

to

zero.

statistic

must exist:

• Program 0 must be selected.

•

The

record length

• No

data

has been

• No leading

must

entered

automatic

be 21 positions

into

duplicate/skip

executed.

After

the

production

enter

mode,

they ADV. Also, the

cursor

when

is

positioned allows additional to

the

record length, prior

statistic

can be

the

data

counters

written

counters

at

position

to

be keyed

to

pressing record advance.

can be displayed

written

counters

and

on

in

read index

DISPLAY PROD

the

data

set label

statistic

counters

data

counters

set label

in

enter

or

the

current

fields have been

are displayed

on

disk by pressing REC

are displayed

22.

This positioning

beyond

position

in

read

disk

in

enter

data

display

to

be

are

not

to

be displayed

mode,

greater.

record buffer.

in

enter

mode,

22

up

TRACK

01

02 03 04 05

06

07 08 09 10

11

12

13 14 15 16 17

18 19 20 21 22 23 24 25 624* 26 27 676* 28 29 30

31 32 33

34 858*

35

NUMBER OF RECORDS

Number of sectors used

on this track 26* 52* 39 988* 78* 40 104* 130* 42 156* 43 182* 208* 234* 260* 286* 312* 338* 364* 390* 52 416* 442* 54 468* 55 494* 520* 546* 58 572* 59 598*

650*

702* 64 728* 754* 66 780* 806* 832*

884*

TRACK

36 37 38

41

44 1118* 45 46 47 48 49 50 51

53

56 57

60 61 62 63

65

67 68 69 70 71

72

73

NUMBER OF RECORDS

910* 936* 962*

1014* 1040* 1066* 1092*

1144* 1170* 1196* 1222* 1248* 1274* 1300* 1326* 1352* 1378* 1404* 1430* 1456* 1482* 1508* 1534* 1560* 1586* 1612* 1638* 1664* 1690* 1716* 1742* 1768* 1794* 1820* 1846* 1872*

The

record

is

written

incremented by

duction

mode. See

statistic

the GA21-9131, for a production

TRACK

Figure

statistics

TO RECORD CONVERSION

16

is a track

vided as a quick

records keyed.

tive

to

production statistics for

The

conversion

is

being maintained

counter

number

and

totals

of

records keyed

on

one

when R EC

counters

disk and

are

not

the

ADV

reset

IBM 3741 Data Station Operator's Guide,

complete

to

method

The

conversion

description

counters

in

read index

record conversion table. It

for determining

table obtaining

table

could also be used when a grand

in

the

production

for individual

is

shown for

batches

disk address is

pressed.

to

zero

on

TABLE

the

is

an accurate alterna-

a record

in

how

or

enter

number

is

The

enter

to

is

count.

display

mode.

pro-

st"atistics record

are desired.

~ach

track

on

pro-

of

total

The

the

disk.

* Add the number of sectors used on this track

to

get the total number of records

Figure 16. Track

Note: The conversion

records

the

The

on a track.

number

EOD

determine

remember number

to

of

deleted records

address

the

number

that

the

of

records in

Record Conversion

table

assumes

If

there

are

deleted

from

in

the

data

set label can also be used

of

records in a

EOD address

the

data

set.

there

the

data

is

one

Production Statistics

to

this number

are

no

records,

subtract

total.

set. However,

more

than

deleted

to

the

actual

35

Chapter

Field times where individual cost. read lowing record (crossfooting).

Field process

offline,

ONLINE

Three

Data

from summation

specifies

three fields are with ulators the to of that ulator 4

positions

a field

If

overflow

will

In

may

the

accumulate codes

which

in bits fields

In

only plished

when

read

totals field

5. Online Field Totals

totals

can

be used

referred

totals

Two

out

totals

19-digit can specified fields in

accumulators

a 1,

field

be

accumulated

the

fields used

will be used.

is 2 positions, 3 positions

total

not

addition

include

low-order

accumulate

equal

are

online

when

entering

out

and

totals

to

as

"hash

are

required,

items

on

an invoice

or

more

fields

into a summary

can

be

done

of

entering,

in a separate

FIELD

be algebraically

is

that

identified

2,

or 3 which

is

to

be used.

definition

for 3 accumulators.

field are

beyond

be

indicated.

to

with

the

to B or

considered

field

the

by

pressing

and reset field. A

reset

operation.

updating,

scan

TOTALS

accumulators

under

control

a field

is

the

by

The

character

in

two

is

based

The

added

19

the

numbers 0 through

any

of

the

four

bits

numeric

with a numeric

units

position

D are

positive.

totals,

the

power

is

the R key

a field

in

the

accumulators

to

for

totals",

such as

within

field

(1)

of a batch

summed

any

be

sum

following a field

specifies

second

or on

minimum

digits

256

of

the values 0

considered

accumulators

turned

a record

batch

auditing,

or

summing

to

obtain

a record

in

the

online

on

or

verifying

OPERATION

are provided

in

or

all records in a

of

the

program;

summed

will be placed. Field

which

and

may

be used

three

accumulators.

the

number field length

for 2 accumulators,

The

into

a specified

occurs

EBCDIC codes. All

codes

equal

through

value

codes

have

negative. All

on,

when

with

field

that

good

practice

before

a process some-

for

other

the

can

same

record

the

3741

records,

of

records.

with

these

accumulators

and

in

defintion

of

the

third

positions

to

of

low-order

accumulator.

in an

accumulator,

9,

a field

to 0 through

9.

of

zero. All fields

the

high-order

are reset

a reset is

totals

is

programmed

is

to

starting

total

the

which

cause

accumulators

for

applications

prices

of

order

be

added

or

a fol-

during

or

(2)

this

feature.

batch.

three

The

program

of

the

total

character

accum-

after

the

The

one

accum-

and

14

digits

total

field

codes

All

other

four

other

to

zero

accom-

displayed,

as a

display

an

field

online

and

the

field

length

of

it

with

9

or

During an is

added change comes enter is

always the amount added amount

tracting

amount

The to

the operations deleting a record

from a partially record, from spacing accumulator

Displaying Field

Field

is

at TOTALS. from accumulatoJs accepts the resets all the not

PROGRAMMING

The fields to

be

online

to

an

that

occurs

into

the

mode,

when

blank

amount

accumulators

the

field

reset

following

added

entered.

is

zero

added

the

initial

of

the

most

advanced

on

all

accumulated

the

specified

from

totals

accumulators

beginning

Any

the

screen,

only

two

totals

accumulators

totals

the

for

online

used

by

unless

completed

fields

are

accumulators.

the

accumulator

field until

and

is

field.

the

data

display,

display

describes

field

totals

in

that

the

cursor

its

numeric

to

the

accumulator

In

update

the

field

the

algebraic

amount

represent

record

current

or

backspacing

entered,

Totals

and

displayed. keys,

field

updated,

fields are algebraically

accumulators.

records,

occurs

can be

of

a field currently the

amounts

RESET displays

to

zero. Pressing

and

ONLINE

how

totals

operator.

operation,

in

a given field

field

from

the

cursor

comes

value

or

verify

is

modified,

difference

of

the

written

record

as

they

by

pressing

being

At

this

and R. Pressing R removes

the

displays

FIELD

to

program

when

the

time

leaves

into

a field,

is

zero;

is

equal

mode,

obtained

field

from

field

totals

on

disk

being

processed.

to

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or

verify-corrected

When

record

no

subtraction

are

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displayed

DISPLAY

displayed

currently

point

data

set RESET

the

record,

TOTAL

the

you

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amount

is

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therefore,

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and,

the

operations

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when

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the

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FIELDS

field

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the

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field.

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by

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final

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back-

of

over.

the

cursor

FIELD

is

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in

the

and

removes

but

does

total programs

36

Accumulate

To

indicate

lated

into definition a field

definition

data

record

field

definition

field in

lator 2 or program lated.

Figure

accumulator

by

tains

in 1

In equal update lator if algebraic

and

the

The

corresponding field in record accumulated accumulator

17.

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may

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N 12-··field,

the

data

and

2.

enter

to

or

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zero

modified,

the

final

3 respectively. Figure

containing

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than

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the

difference

Totals

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character

data

record will

A .....

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/'

the

data

be

into

1.

be

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one

this

record

the

amount

verify

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Fields

fields in a

in a

accumulated

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accumulator,

program

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fields

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accumulator

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The

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record accumulated accumulator

of

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the

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the

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accumulator

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3.

the

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E

the

data

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than

one

character

if a

program

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accumulators

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accumulator

of

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to

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is

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field

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D·····R·····B7-·········A .... B9-··-A .... E

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ram

field

1

the field and

1 will be

Figure

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all

when

You reset. If reset

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verify subsequent minimum record be

done

designed specifically

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record,

record.

Note: If

Reset ing

procedures

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update

a

new taining was

set character desired

'-f

field in

indicates

will

corresponding

then

18.

of

performing

can

at a different

records

mode

that

field

character

the

up

character

totals

accumulator

be

read

in

the

accumulator reset

Example

the

accumulators

select desired,

with

that

Read

of

one

contains

by

setting

or

the

record

does

mode,

Read

with

into

the

data

which

by

do

a field

the

that

out

to

of

a field

each

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Out/Reset

character

actually

not

is

considered a change

Out/Reset

record,

into

~

prog· This field in

into

record

zero.

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Out/Reset

have

totals

accumulators

accumulator

time

during

field

totals

affect

the

field, it

be

the

Read

up a program

to

allow inserting

changing a character

containing have

to

be

have

to

rekeying

an

field.

designed

the

that

field.

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read

a field

are

accumulated

changed

Out/Reset

the written

be

existing

to

operator

that

into

the

accumulator

reset

to

Field in a Program

to

be

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to

can

be

totals

changed

is

required

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to

followed.

character

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the

program

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3 will

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3 will

zero.

out

and

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out

read

out

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in

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totals

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inserted

fields.

disk,

the

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into

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the

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Out/

the

or

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the

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example

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field

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are

reset

field in a

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a Read

program,

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accumulator

3.

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read

out/reset

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fields allows

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follow

a 7,

8,

or

1,

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the 9 means

must

be

field. Figure

field in a

the

data

record

To

indicate

the

bypass

9.

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to

at

least

program.

accumulators

and

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field

to

read

out

read

out

and

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manual

18

shows

For

verify

the

one insertion Read

Out/Reset

any

character

data

key, operator field

correct allows should a field

mode,

character

of a character

desired.

the

3741

must

press

mode.

insertion

select

correct

of a character

the

operation

the

operator

field

field, select field

goes

the

If a

shortest

that

was

into

the

Once

back

same

program

field in

on

the

can

the

into data

into

position

programmed

record

containing

correct

operator

cannot

the

field.

verify

key

that

the

record,

record

Online Field

mode,

has pressed a

mode

be

the

to

was

set

and

cursor

allow

the

and

key

and

the

pressed in

up

that

the

operator

perform

Totals

at

37

Online Field

To

ensure

remember

• Use

• When backspacing entered,updated, used to

Total

the

accuracy

the

following restrictions:

only

one

for

the

previous record

Restrictions

program

previous record

of

the

field

total

in

the

accumulator,

to

process a record.

to

a previous record from a partially

or

verified record, select

only

after

is

complete.

the

backspace

program

• Program load

Turn

1.

2. Press REC BKSP

3.

Select program buffer

Read program from second disk

4.

Load

5.

functions

off

the

should

be

AUTO DUP/SKIP.

to

the

previous record.

O.

program.

done

or

as follows:

key program.

• Before deleting a record, be sure

create

the

record

is

selected.

A read

• programmed

within

to

that

• Do

not a read to

that accumulator record was program that

field in

mode.

•

After a record in set

fields executed. advance field, select vance over

out/reset

the

accumulator.

backspace

out/reset

read

for

updating

to

field

must

be

manual field

same record

to

field if

out/reset

will have a value

written

that

accumulator

enter

mode

a record, deleting a record,

the

verify

that

were

To

execute

the

record

the

correct

the

read

and

by

a field

a record and select a program

the

accumulator

has a value

on

the

disk with a field

or

changed in

mode,

all succeeding read

affected

out/reset

by

this

field

that

contains

program buffer,

preceded must

other

and

field.

the

program used

not

totals

other

than

data

the

operation

total

operation,

the

by

at

least

be followed

field relating

that

pertains

than

zero.

zero if

any

totals

was

entered

update

or

correcting

out/re-

must

record

read

out/reset

and

field ad-

to

one

with

The

in

verify

be

Repeat 4 and

6.

7. Press REC BKSP.

Press REC ADV twice.

8.

Note:

Steps

buffer

with

9.

Select desired program.

• When

in

a record

perform

1.

2. Record backspace

3. Select

4.

5.

the

following:

Set

AUTO DUP/SKIP

correct

Press REC ADV.

Set

AUTO DUP/SKIP

5 for all programs

7 and 8 are

the

correct

with

the

program.

done

record.

wrong

to

OFF.

to

the

previous record.

to

ON if required.

to

be loaded.

to

load

the

• In

update

option

is

not cursor through

REC

• When field use programs), at

any

38

mode

or

when

in

enter

mode)

executed

enters

ADV.

communications,

time

that

all read

totals

or

during

if R

field.

out/reset

are being used

printer

online field

E-R (alternate record advance

is

selected, a read

EC

ADV

is

pressed

Therefore,

fields before pressing

second disk functions

advance

in a data

(except

totals

operations.

out/reset

before

the

set,

if loading

print

field

the

cursor

do

not

record)

Example

The

transactions

Item

Number

for

one

day

31621

10897

41621

10021

21100 1100

Total

Cost

of

business are:

Item

1621

734

1621

121

5197

Cost

Each

transaction

item

cost.

After

the

transaction

must

determine

during

the

be

precomputed,

and

the

total

a

summary

pared

with equal, all not smaller or

4463, that

not

To

the

equal,

total

duplicated.

subtracting

the

transaction

entered

use

the

accumulator

N

----

R 2

--------

To

read

accumulator 2 into

the

accumulator

summary

N

----B

record:

8--------

record

Each

item

if

entering

and

cost

record.

the

precomputed

transactions

the

larger

to

determine

For

on

the

cost

as a field

2, use

E

to

E

contains sold records are

any

of

the

process.

programmed

from

the

Then

total

example,

4463

from

for item

disk.

totals

the

following

zero, use

the

item

is

considered

entered,

transactions

To

do

this

as a field

accumulator

the

field

totals

total

cost.

were

entered.

can be

subtracted

which

transaction

if

the

field

5197

gives

number

field

10897,

to

program:

the

summary

the

following program for

number

one

transaction.

the

operator

were

skipped

the

cost

totals

must

be read

total

can

If

the

totals

If

the

totals

from

was

totals

total

734

which cost

be

accumulated

record

and

field

field,

be

com-

are

the

skipped

is indicates

734,

and

reset

must

into

was

in

the

Auto

The

online field

when

balance using

online

or

update

the

field

Balance

an

Example

totals

accumulated

sheet

total.

field

mode,

only

and

the

new

accumulators.

For

example, performed ordered. lete,

the

assume an

to

accumulate a total

When

the

field

totals with a precomputed that

the

field

totals

not

match,

online (or verify) and field difference

value some

if

the

for. If

difference was

mode

make

appropriate

totals

between

of

the

records,

difference

not,

in

update

field.

the

operator

accounted

to

between

feature

total

does

Errors

in

totals

in

update

differences

value are

offline

field

total

can be displayed

total

on

total

and

field

totals

find

the

record(s) in

corrections

or

verify

the

old

value

Therefore,

accumulators

the

would

for.

can be used

not

match a precomputed

the

records or

verify

between

accumulated

field

totals

on

the

total

totals

operation

a balance the

sheet.

precomputed

could be used

error

to

the

records.

mode

accumulates

of

the

field

after

the

operator

could

be

totals

has

been

continue

to

find

can be

found

mode.

the

old

into

operation

cost

is

and

compared

Assuming

total

in

update

(or

and

the

changes

displayed

accounted

until

the

errors

I n verify

value

the

was

of

items

comp-

do

missing)

Online

only

the

new

to

see

by

of

Online Field Totals

39

Chapter

Field is

sometimes

cations

prices

order

The from verified. accumulators specified

may

256

bits

9. units

a B

The

•

• Read field

6. Offline Field Totals

totals

where

of

individual

cost.

offline

records

The

fields

include

EBCDIC

equal

to 0 through 9 are

All

other

position

or D are

offline

Accumulate

without

can

be

used

referred

totals

field

that

offline to

any

characters.

codes

negative fields.

field

totals

resetting

to

are

items

totals

feature

have

already

field

add,

under

into

the

number, 0 through

have

with

totals

feature

totals.

from

the

for

batch

auditing,

as

hash

totals,

required,

on

totals

assigned

All

the

an

accumulator.

such as

an

invoice

is

used

been

feature

program

accumulator.

codes

added

value

of

high-order

allows

accumulator

to

or

for

other

summing

to

obtain

to

obtain

entered,

control,

9,

with

O.

you

updated,

uses

three

data

and

anyone

low-order

a value

All fields having

four

bits

to:

into a record

obtain

what

appli-

the

total

totals

19-digit

in

A field

of

four

of 0 through

equal

or

total

the

to

When

the

lators

are

control

that those fields are character which operation.

The

into bypassed invalid

operation.

If operation, following REC the operation the

of a program

was

followed

of

low-order the

control

AUTO

ADV

field

totals

reset

to

zero.

satisfied. Field

by a number, identified with a number

the

specified

in a field

RECADV

the

to

record.

changes

totals

by

accumulators

14

digits accumulators.

totals

statement

is

field

totals

last

record

process

Pressing

the

operation.

operation

specified

following a field

of

turned

the

mode

is

Records

by a control

definition

are

(1

through

are

involved in

a field

operation.

errors

stop

off

operation

processed

record

RESET

to

update

initiated,

are

ignored.

totals

Deleted

during

displayed

during

the

processed

statement

characters,

Field

definition

9)

which

the

field are

records

Disk

errors

the

field

a field

stops,

and

is

displayed.

and

a field

mode

accumu-

under

except

totals

specifies

field

totals

added

are

and

totals

the

record

Press

advance

totals

and

terminates

to

• Read field and

OFFLINE

The

offline

read

index

the

mode

the

status

Guide,

ating

procedures.

Offline

Programs formed to

be

processed

each

record. A description

control

later

in

totals

reset

the

FIELD

field

or

update

changes

line.

GA21-9131,

field

totals

define

and

control

statements

this

chapter.

from

accumulator

TOTALS

totals

feature

mode.

to

field

See

the

IBM 3741 Data Station Operator's

for

information

require

what

field

statements

and

which

for

field

an

accumulator

to

zero.

OPERATION

can

When

totals

and

programs

totals

operations

identify

program

of

how

totals

operations

be

selected

this

an F

on

and

is

to

prepare

feature

into a record

from

is

displayed

field

totals

control

which

be

statements.

are

to

records

used

programs

is

provided

the

selected,

in

oper-

be

per-

are

to

process

and

At

the

end

retain

the

reset

was address mode

Displaying

The can

For not how

operation,

Guide,

is

changes

contents

be

displayed

the

3741,

at

the

to

display

GA21-9131.

of

a field

accumulated

the

last

operation

reached,

Offline

end

see

the

to

read

Field

of

the

any

the

cursor

of

record

the

accumulators

the

IBM 3741 Data Station Operator's

total

field

data

index

field

time

Figure

operation,

totals performed. set

label

mode.

Total

Accumulators

total

accumulators

during

must

be

condition.

19

shows

the

accumulators

unless a read

If

is

displayed,

the

field

at

the

start

For

information

during

a field

the

field

out

the

end-of-data

and

total

operation.

of

a field

totals

and

their

and

the

sign

and

on

display.

40

~

'"~

II

{ 2000000ooooooonnooo+

Accumulator

Figure

19.

PROGRAMMING

The

following describes

fields

V'Jhen

operator.

Accumulate

To

indicate

lated

into

tion

character

field

definition

contents

lated

into followed the

data

or

3 respectively. Figure

containing

1

Field Totals Display

you

are

Totals

which

a field

totals

in a program followed

character

of

that

field in

accumulator

by

a 2

or 3 means

records will

field

totals

'"''

OFFLINE

how

writing

Fields

fields in a

accumulator,

followed

the

1. A field

be

accumulated

20

fields

n""

~_~

Cursor

FIELD

to

programs

data

the

is

that

TOTAL

program

records will be accumu-

contents

an

will be

the

to

be

record

are

use

any

by a 1,2,

by

a 1 means

definition

of

into

example

accumulated.

used

that

accumulator

of a program

FIELDS

field

totals

by

the

to

be

accumu-

field defini-

or

3. A

the

character

field

Sign

in

2

Read

Out

Field

Totals

The

field

totals

accumulations into a data zero. bypass field

6.

The

the

in

the

field in

read

D-----R

record

To

indicate

definition

4 means read

record, 5 means read

record,

out

and 6 means

the

record. Figure

field in a program.

-----B4----B5----A .... B 6----A ... E

7~

This

field in This field in

the

program

indicates field accumulator will be read out corresponding

field in data

Figure 21. Example

Not

all

performing

select

accumulator a field

that

totals

into

the

record.

of

the

accumulators

a field

the

accumulators

can be read

totals

operation.

Fields

without

a read

character,

out

the

indicates field

1

accumulator will be read out

corresponding

field in data

of

a Read

totals

to

can

be

read

resetting

out

accumulator 1 into

out

read

the

accumulators

field in a

accumulator 2 into

21

program,

B,

followed

out

accumulator 3 into

shows

an

-v-~

This

program

that

totals

into

the

record.

Out

Field in a Program

have

read

out

be read

out

at a different

the

indicates field accumulator

2

will be read

out corresponding field data

to

be read

operation.

out.

If desired, each

out

and

use

by a 4,

the

example

field in

program

that

totals

into

the

in

the

record.

out

when

You

point

placed

to

the

5, field in the

field

of

3

can

du.ring

or

a

A ..... N 1----R-----N2--V----------E

'-y-/

The

cotsponding

field in

accumulated accumulator

Figure 20. Example

A field

accumulator ed contains record

the

record will be

may

by

more

a N 12--- field,

is

accumulated

-v-~

data

into-

1.

of

be

accumulated

by

using

than

one

The corresponding field

in

the

data accumulated lator

2.

a Program Containing Field Totals Fields

into

more

any

field

definition

number.

the

in

For

example,

corresponding

accumulators 1 and

record will be

into

accumu-

than

one

field

character

if a program

field in

the

2.

totals

follow-

data

Read

Out/Reset

out/reset

Read be read accumulators

set acter, and accumulator

accumulator out/reset

into

field in a

B,

followed

reset

accumulator

field

Field Totals Fields

field

totals

field allows

a specified field in a

are

reset

to

zero.

program,

2, and

3. Figure in a program.

use

the

by a 7,8,

1,

the 8 means

the 9 means

22

shows

bypass field

or

the

data

record

To

indicate

9.

The 7 means

read

out

an

example

Offline Field Totals

accumulators

and

then

a read

out/re-

definition

read

out

and

reset

and

reset

of

a read

to

the

char-

out

41

D-----R-----B7 --·-B8----A .... B9----A .... E

This field the

indicates field accumulator will be read out corresponding field in data and accumulator wi to

Figure

Not

all

when

You

can desired, different

/\~

in

program

that

totals

1

into

the

record

then

1

II

be reset wi

zero.

22.

Example

of

the

accumulators

performing

select

each

point

a field

accumulators

accumulator

during

I his field in This field in

the

program indicates field

totals accumulator will be read will be read out

into corresponding field

in

the

data

record

and

then

accumulator

II

be reset will be reset

to

zero.

of

a Read Out/Reset Field in a Program

have

totals

to

can be read

a field

totals

that

the

to

read

be read

the

indicates

field

2

accumulator

out corresponding field in data and

2

accumulator

to

zero.

be read

out/reset

out

and

operation.

program

that

totals

into

the

record

then

out

and

operation.

and

reset. If

reset

3

reset

at

a

• Identifies be

compared

• Identifies compared, being

compared,

tions

in

order

• Must

• Identifies

Figure

not

be selected

ment

is

satisfied.

The

fields in accumulated of

each field

The

fields in value will

The

fields value will be read set

to

23

identifies

which

positions

against

what

character

what

character

or

some

for

the

be loaded

when a control

the

zero

program

The

the

and

must

the

be

read

in

the

(if

indicated

the

into

current

in

the

compare

must

should

combination

control

any

statement

to

use

selected

record

into

which

be

accumulated.

record

into

(if

record

into

and

by

control

the

current

characters.

be

at

a position being

not

statement

program

when

the

program

that

accumulator

that

indicated

that

then

the

program).

statement

record

be

at

a position

of

both

condi-

to

be

satisfied.

buffer

that

is

satisfied.

control

are

an

by

an

accumulator

format

state-

identifies:

to

be

the

accumulated

the

program).

accumulated

characters.

are

to

will

contents

re-

CONTROL

Offline the

field

satisfied, causes a

processing

• Must by statement)

•

Maybe buffer.

STATEMENTS

field

totals

operation. A control

the

record. A control

start

with

which

the

.

continued

require a control

particular

a <

field

program

character

totals

program can

in a consecutive

statement

statement,

to

be

statement:

(this

is

the

identify a control

or

higher

as

when

selected

only

means

numbered

part

for

of

42

Character

<

f

eee

Meaning

This

character

a field

totals

be

in

the

buffer used for

The f stands for 9 or A

on indicates which program if this

control

eee stands for a 3-digit position

indicating that

is

to

characters.

(001-128) 3741

identifies

control

first position

control

any

the

3741.

statement

the

position in

be

compared

the

program as

statement

of

every program

statements.

character

The

character

is

to

is

satisfied.

the

with

the

data record

and must

1 through

be selected

number

compare

Control

The statement control

Note:

characters are a representation The

used.

<

The buffer

than buffer

Statement

following paragraphs will discuss each

characters

statements.

In

the

upper case characters are

(Less

Than Sign)

less

than

as

being a field

sign

must

that

contains

Format

following descriptions,

sign

«)

be

in

Character Description

and

also build an example

the

identifies a totals

control

the

first position

a field

totals

of

entries exact

statement

statement.

control

of

the

lower case you

must

character

in

of

every program

statement.

control

of

field

make.

to

be

a program

The

less

Wor

m

&

N

W indicates

record in

the

search that the

compare

m stands for

the

record position

A

comma

characters.

The

comma

compare

The & is

perform logical AND functions. AND function allows

that

must

fore

More be

in

used

that

the

must

contain

control

the

two

match

the

than

a program buffer.

to

statement

to

be satisfied. N indicates

record position

character.

the

character

is

(,)

must

separate compare

(,)

is

used

characters (m).

used

in a control

or

more

positions

the

compare

record

is

processed.

one

control

separate

control

position the

character used

in

order

must

with which

to

be compared.

to

separate

statement

you

to

in

characters be-

statement

The;

statements.

in

the

for

not

have

The

indicate

the

record

can

must be

to

<

f (Program

The selected if

f can be 1

Buffer

f stands for

the

control

through

to be Selected)

the

program

statement

9 and hex A.

buffer

< f

eee (Three Digit Position Number)

The

eec

stands

for a

three

digit position

indicates

with

field are 001

the

position in

compare

through

the

data

character(s). Valid entries for

128

for

the

number

is

satisfied.

record

3741.

that

For

number

that

is

to

be

the

3741,

that

compared

the

eee

Field

total

cOlltrol continued To continued

use

control

ram buffer.

The control the

Figure

23.

Control

Statement

to

a higher numbered buffer.

indicate

the:

last

that a control

in

a higher numbered buffer,

after

the

statement

period (.) indicates

statements. control

Format

statement.

Characters

statements

statement

last position in

the

current

the

end

Place

the

can be

of

the

prog-

of

the

period

is

after

< feee

Offline Field Totals

43

War

N Field

. (period}-End

of

Control Statement

This field

present indicates

must statement The ccc must control The W or

is

used

Of

absent

that

the

contain

N indicates

the

in

order

not

contain

statement,

N must follow

to

indicate

in

the

position specified

position

character m specified

for

that

in

the

control

the

position

the

character m specified in

order

the

< fcccW

< fcccN

m Field

The

m field stands for position specified be

any

character A through Z, 0 through 9, character. The character, m, acter.

The

compare

field.

the

by

ccc

character

character with which

is

whether

the

to

position number ccc.

to

is

a character should be

by

record specified by ccc

in

the

statement

in

the

satisfy

the

be compared.

called

must

follow

to

record specified

control

The

or

the

compare

the W or

ccc.

The

control

be satisfied.

the

statement.

the

record

m can

a special

char-

N

W

by

The period (.) indicates

If

there

is

more

than

must be

at

the

end

the

one control

of

the

last

< fcccWm.

< fcccNm.

end

of

the

statement,

statement.

control

the

statement.

period

; (semicolon)-Multiple Control Statement Separator

The

semicolon statement each control which

must control against

the

statements

record

is

<fcccWm;fcccN m.

is

used when

in

a program buffer. statement

have a period (.). When

statements,

current is

read.

each control

data

satisfied. If none are satisfied,

there

except

the

record until

is

more

than

one

The

semicolon must follow

last control

there

statement

one

statement

are multiple

is

compared

of

the

control

the

< fcccWm

< fcccNm

A position one the

control

'--

_________

~---------....r.·must

in

a record can be compared against more than

character. However, each compare character m

statement

<fcccWm,m,m

<fcccNm,m,m

must be separated by a

position bei

The

I

-'.must have acters specified

to

satisfy the control

IThe position being checked

characters specified

in

order

statement.

not

one

have

to

satisfy

comma

ng

checked

of

the

by m in

any

of

the

in

(,).

char-

order

statement.

the

by

m,

control

Note: When coding multiple control statements, place

control This will save

statement

time

that

will be satisfied

in running field totals operations.

most

often

first.

: (colon}-Control Statement Continued in a Higher Numbered Buffer

Control numbered buffer. When a control in last character (:) can

Program buffer 2

statements

a higher numbered buffer, place a colon (:) after

be

placed

can be continued into

in

the

current

after

program buffer.

an y character desi red.

another

statement

Control statement character

is

continued

The

continued

higher

the

colon

the

44

Program buffer 3

When a control

numbered buffer, it secutive higher numbered buffer. to

be

continued

statement

does

in

a higher

will be

not

have

numbered

continued

to

be

in

The

statement

buffer.

in

the

a higher next

con-

has

only

This control

....

data

record has an A

2 will be selected if

statement

will be satisfied if

or B in

the

position 2. Program

statement

is

satisfied.

the

current

buffer

Program buffer 3 I

Program buffer 6 I

Note: If

treated colon (:), and

in

the

as a compare

a higher numbered buffer,

compare

the

control

<fcccWm,m,m;:

<fcccWm.

character m is

character. Therefore, if m

~

~control

comparing position a colon (:)

<fcccWm.

'-------

& (ampersand) Logical

The

& (ampersand) can be used in a

perform a logical AND than

one

position

control

Example:

satisfied if position

position

process

The

ment

Example

statement.

<fcccWm&cccWm.

<1010WA&020W4.

20

the

record if

Examples

following are examples using all

format

1:

I

....

AND

function.

in

a record can be compared against

10

of

has a

4.

Program the

characters

<2002WA,B.

control

that

~

a colon (:), it

statement

the

are available.

,periOd

"of

will be

another

record has an A

buffer

colon

continued

in

control

This means

This control

1 will be selected

statement

of

the

must be

the

control Comma must pare characters.

Less

than

sign

the

first position

program buffer

contains a

control

continued is

record

statement

is

control

statement.

separate

must

is

a

needed.

for

that

more

AN

D

satisfied.

state-

at

the

end

com-

be

of

each

that

statement.

in

to

the

is

to

Example2:

This

is program will first check A

or B in

the

control will be selected statement

program goes

to

see if it can be satisfied. This satisfied if position a V. Program record if this is

satisfied,

Example

Program buffer

This

is

higher numbered buffer.

(2002WA,B&031WH)

The

control

position 2

31

has an

.

data

record if

statement

(4042W6,7,S) will be used. ment

control

record has a processing neither

<2002WA,B;1010NV.

a multiple

position 2. If

control

statement

to

process

2002WA,B

to

the

buffer 1 is

statement

the

3:

5:

a multiple

is

continued statement

statement

of

the

H.

Program

the

is

not

6,

7,

the

data

control

data

statement

satisfied,

in

is

or

record if

is

<2002WA,B&031WH;4042:

<W6,7,S.

contains

record has an A

a higher satisfied if position S. Program

satisfied,

'Control

statement.

to

see if

there

is

satisfied and program

the

record. If

not

satisfied,

control

of

the

data

selected

is

satisfied. If

record

statement The

first

2002WA,B&031WH

buffer 2 is

is

satisfied. If this

the

numbered

the

statement

The

the

data

an A

or B in

the

statement

control

is

a logical AND

buffer 4 is

statement

record

for

processing

neither

read.

ILOgiCal AND

Control separator.

that

is

control

or

selected

control

that

this

buffer.

42

separator

field

totals

record has an

position 2,

buffer

2

first

control

field

totals

(1010NV)

is

does

not

have

the

data

statement

function

/.

Control ment tinued higher numbered

(5).

continued

statement

is

satisfied if

B AND position

to

process

statement

control

of

selected for

is

satisfied. If

record

state-

con-

in

buffer

statement

function.

the

control

state-

This

the

data

is

read.

in a

Offline Field Totals

45

Unconditional Program Buffer Selection

only

one

If field that The

program

totals

operation, a control

will

unconditionally

general

control

is

required

select

statement

to

process records in

statement

the

desired program

is as follows:

<f.

can

be

the

written

buffer.

Four

different

This example used program buffers 1-4 for

Program

positions 30-35

To

program a field as a field

2. definition tor.

All field

those

used by field

programs are required

buffer 1 contains

of

the

data

followed

by

definition

totals

1,2,

characters

to

do

the

program

record

totals

or 3 to

fields are ignored.

to

into

accumulators

field, use

indicate

in

the

these

add

the

any

the

accumula-

program

operations.

programs.

field in

1 and

field

except

where f

through 9 and

Offline Field

An offline field data The the

Figure for each record

first the needs

Depending types

1.

2.

3. Read

is

set

that

field

totals

content

24

column

second

to

be

of

field

Add

record

the

of

shows

column,

performed.

upon

a field

the

is

the

desired program buffer

A.

Totals

Example

totals

operation

contains

in

total

buffer

operation

the

records.

the

field

type.

the

figure

the

type

operations

to

both

field

to

contents

and reset

several

to

totals

If

the

contains

operation

of

accumulators

accumulator 2 only.

of

accumulator

is

to

be

different

be performed

record

record,

are performed:

the

kinds

operation

type

the

data

in

the

one

1 and 2.

accumulator.

number

performed

of

records.

depends

to

be

performed

indicated

third

column

of

four

different

1 into

the

1

on

a

upon

by

the

by

current

I n this

example programmed as bypass fields. buffer

1 is:

B

----------------------------N

Program positions The

program in program

B

----------------------------N 2 ----

all fields

12---E

'-v-'

Field in positions 30-35

buffer 2 contains

30-35

of

the

data

'-v-'

Field

in

positions

except

totals

the

buffer 2 is:

E

totals

the

field

The

program

field

program

record into

field

30-35

totals

field are

in

program

to

add

the

accumulator

field in

2.

4.

Type

Figure

46

Add

of

24.

the

Data

2

3

4

Field

field

Record

Total

to

accumulator

Operations

3.

Contents

A

in

position 10 and B

Numbers in position

Blanks

in

positions

All records of

the

that

do

other 3 types

50

not

of

or C in

through

satisfy

records

position

55

the

conditions

25

Desired

Add

the

record

Add

the

record

Read

into

the

reset

accumulator

Add

the

record

Operation

field in positions

to

accumulators

field in positions

to

accumulator

the

contents

record

in

field in positions

to

accumulator

30-35

1 and

2.

30-35

2.

of

accumulator

positions 1-10

1.

30-35

3.

of

and

of

the

1

the·

Program buffer 3

accumulator 1 is

into positions 1

also causes

in

program

B 7

••••••••

'-.t-'

Field

accumulator 1 to

buffer

E

that

accumulator 1 is

contains

to

be read into.

thorugh

3 is:

the

10

program

of

the

be reset

read

for

The

accumulator

record.

to

into

the

The

zero.

record

is

program

The

program

that

read

Program Buffer 7

<054W~&055W~

'-

v

Continued from

program

Offline Field

buffer

;4.

",-.-

~s

6 program level has

Totals

Setup

program buffer 4 if another

not

been selected.

Example

Program in conditions through buffer

B

_

To

be selected control satisfied before a program ments for this control

is

that

program buffer.

Program Buffer 5

<101

buffer 4 contains

positions

••••••

cause

used

the

Selects program buffer 1 if position an A and position contains

30·35

of

to

use

the

3 are

not

satisfied.

4 is:

_._

•. _ •• _ ••..•••••

the

statement

at

the

control

OWA&025WB,C

_-.

N 3--·· E

'-.t-'

program

automatically,

indicates

example

is

end

of

statements

The

10

contains

a B

or

a C.

the

programs

Field in

that

separated by a semicolon.

program buffers 5 and 6

control

25

positions

begin

the

program

record

in

accumulator

in

program

The

program

totals

field

30-35

is

to

process each record

write

control

the

conditions

is

selected.

in

program

are

continued

statements

;2050WO,1,2,3:

~

Selects program 2 if position

numeric. This statement in

program

to

add

the

buffers

in

program

statements.

that

The

control

buffer

to

in

a higher

follow:

50

is

continued

buffer

field

3 if

the

1

type

must

state-

5.

Each

The

colon

indicate

buffer

is

control

6.

Each be

to

The

following statements data.

When writing programs required for a total

fields, keying the

record. This writing to

process records

For example, assume programs with field

been

written assume position being used keyed. Also assume and

data

program

Record 1

I'

The

when

set

the

program

the

offline field

that

position

in

the

to

can

number

DATA.

second

is

an example

different

aside

number

one

in

and are

data

record

control

that

now

be keyed.

1.

......

data

record requires program

of

programs are used

one

position

used

position field will assist

totals

the

data

in

program buffers 1,

20

in

the

into

the

format

enter

19-20

21

lit

an easy

job

in

the

when

control

set.

The

ATA

statements

program represents

which

of

the

mode has been selected

first

..................

A

one

is tion (20) program to

control

data

record.

way

to

write

for

entering

that

has field

program for

keying

data

you

totals

fields have

2,

and

the

program

record wi

data

record requires

keyed

into

to

indicate

number 1 was

the

format

number

control

for

in

required

3. Also, the

number

II

be

this

posi·

that

used

of

this

2.

80

·1

Program Buffer 6

<,4,5,6,

~.

Continued

program

7

,8,9;3050W~&051

from

buffer

5

W~&052W~&053W~&:

~-----------

Selects program

fiO-55

are blank. (The ~ represents

a blank space.) This

is

continued

in program

buffer

control

3 if positions

statement

buffer

7.

Record 2

DATA

.......

A

two

is

keyed

tion (20)

program to data

to

indicate

number

control

the

record.

Offline Field Totals 47

into

this

2 was used

format

that

of

posi·

this

The

third

record requires program

number

3.

The

control

statement

would

be:

Record 3

( DATA

This process

keyed. Position program record.

After

all

totals

the

data

under

tion

can

process

.......

continues

that

was used

data

has been keyed, assume

operation

set has a position

which

data

be

used

the

job

191~ATA

until all

20

in

the

data

to

control

will be

performed.

20

was keyed

in

writing

in offline field

..................

A

three

is

tion (20)

program

to

control

data

record.

data

records have been

record identifies

the

Since each record in

that

identifies

for

the

record, this informa-

control

statements

totals

mode.

keyed into this posi-

to

indicate

number

the

format

that

3 was used

format

an offline field

the

of

each

the

program

required

of

this

to

8°1

~~

This

control

ment

will select program 1 if position

in has a tion a number used the record mode).

If

assist

number

the

data

one

(posi-

20

will have

one

if program a

1 was

to

control

format

in

enter

the

preceding

you

in

<1020W1

'--'v-"~~

state- This

ment program

the

technique

2 if position

in

the

has a

tion

two number used the

format record mode).

20

record

of

using offline field

; 2020W2 ;

control

will select

number

data

record

two

(posi-

20

will have

if program

2 was

to

control

of

in

enter

can be

totals

3020W3.

ment program 3 if position in has a tion a number used the record mode).

mode.

t

the

three

20

three

to

format

will select

number

20

data

record (posi-

will have

if program

3 was

control

of

the

in

enter

it will

state- This control state-

20

the

implemented,

48

Chapter 7. Second Disk

Dual disk capability is an additional disk drive provided feature.

The

second disk

obtained

unit

on

the

3741

by

means

of

by

the

second disk

is

to

the

left

of

the

first

disk unit.

The

purpose

of

second disk

operations

is

to

permit

the

following:

Duplicating a disk in

1.

copy

or

to

save

data

from a disk

order

to

have more

that

than

one

has developed

a defect.

2. Merging records from a disk

with

records from

the

keyboard.

3. Pooling

the

data

from

several disks

onto

one

disk.

4. Extended program storage; programs can be loaded

into

the

program storage buffers from

disk

without

removing

5. Expanded storage

for

the

disk 1 disk.

use

with

the

communications

second

feature.

DUAL DISK OPERATION ON

After of

any

disk 2

insertion

of

at

the

track

of

a disk

following

00,

sector

operations

THE

in

the

second disk drive,

08,

and displays

3741

the

first

activates disk 2, positions

the

sector

08

label.

address SEL lower and

to

be removed from

the

A key will remove

address.

Disk 2

is

read

but

not

written

cations mode. Disk 2

is

controlled

• Disk 2 record advance

• Disk 2 record backspace

• Disk 2

return

to

index

• Copy

• Search

• Search sequential

content

• Search address

SEARCH OPERATIONS

The

following procedures are used

1. Press FUNCT

2. Hold

down

NUM

SEL

ON

lower.

SHIFT CONTENT, SEARCH ADDRESS.

the

display. Keying FUNCT

the

existing disk 2

on

except

in

the

communi·

by

the

following keys:

THE

SECOND DISK

to

search

on

and press SEARCH

SEa

CONTENT, or SEARCH

disk 2:

• Disk 2 record advance

• Disk 2 record backspace

• Disk 2 return

The

address

the

status

posted

or

formed. Insertion and removal

by

the

machine and a disk 2 address wise, removing disk 2

to

index

of

disk 2 is displayed

line in positions 31

changed

only

when

therefore

or

remove an existing disk 2 address; like-

does

at through disk 2

of

disk 2 are

inserting a disk

not

cause

the

righthand end

35.

The

operations

not

the

existing

address

are per-

monitored

does

not

dis~

of

is

post

2

3. Key

the

search mask

4. Press FUNCT SEL

After

the

first

content content as

1.

2.

using

the

follows:

Press FUNCT

Press FUNCT SEL lower, hold

search,

same search mask can be accomplished

SEL

and press SEARCH CONTENT.

3.

Press FUNCT

SEL

or

upper

address.

and

DISK 2 REC ADV.

subsequent

and

DISK 2 REC ADV.

down

and

DISK 2 REC ADV.

searches by

NUM

SHIFT,

Second Disk

49

COpy

The

copy function provides:

• Copying all

• Copying

• Copying up

or

part

all

or

part

to

a specified record on disk 2

• Copying a record

Copying

is

always

done

of

disk 2

of

a data set

from disk 2

to

disk

1.

Copy

All

(I

The

primary purpose

two

or

more disks

2

to

the

end sequence into tors

of

the

disk 2 drive and pooling

onto

one

mage Copy)

of

the

such copies can involve loading several disks

disk. Deleted records are

or

Part

of

a Data Set

of

this function

onto

one disk by adding data from disk

data already recorded

the

For operating procedures on copying set, see

GA21·9131.

IBM

3741

Data Station Operator's Guide,

is

to

pool data from

on

work

of

not

copied.

all

or

part

disk 1. A

several opera·

of

a data

Copy All (Image Copy)

This copy function copies disk 2

the

sector

with

last record

extent

(EOE)

the

start

E~ch

record sector address; of

disk 2 will be copied into track

All

records will be copied regardless

in

is

copied from

of

the copy function.

is

copied into the corresponding track and

that

deleted records, records outside normal and

the

data

records between

end

of

data (EOD).

o'r

track

00

the label

is,

the

Part

of

Disk 2

onto

where disk 1

the

sector located

at

which disk 2

record from track

02,

of

the

beginning

Notes:

1.

During a copy

all

or

part

of

disk 2 operation, program

buffers 1 through 8 are destroyed and

restored after

2. The write protect status protect

the

copying

against copying

is

complete.

is

not

checked and does

onto

the

For operating procedures on copying

disk 2, see

GA21-9131.

the

IBM

3741

Data Station Operator's Guide,

disk 1, beginning

is

positioned. The

at

the

end

is

positioned

02,

sector 14

sector

14

of

disk 1.

of

content,

including

defined extents, and

of

extent

(BOE)

should be

not

disk.

all

or

part

of

of at

Copy Up

This function can be used

with records

used All not copy function,

to

a Specified Record on Disk 2

that

are keyed from

to

insert missing records

records

except

including,

deleted records are copied up

the

specified record.

the

to

merge records from disk 2

the

or

add records

specified record

keyboard. It can be

At

is

displayed.

For operating procedures on copying up

IBM

3741

record on disk 2, see

Guide,

GA21-9131.

Data Station Operator's

Copying a Record

This function

allows you performing a search disk 2 operation, DISK 2 REC BKSP necessary record be are displayed,

done

in

enter

to

be copied

in

enter,

mode after

the

find

the

update,

record can be entered

pressing REC ADV. If

to

copy

one

or

DISK 2 REC ADV, whichever

record you

is

on

the

want

disk 2. This copy function can

or

read index mode. If you

record from disk 2 has been

onto

youare

in

update mode after a

record from disk 2 has been displayed,

of

the

record must be rekeyed and If you are M,

in

read index mode, press FUNCT SEL lower,

and REC ADV

to

enter

the

then

record

onto

to

a data set.

to,

but

the

end

~f

the

to

a specified

record

at

a time

by

pressing

to

copy. The

disk 1

by

the

first character

REC ADV pressed.

disk

1.

~

1

by

is

50

Chapter

8. Disk Initialization

All disks are initialized customer. sary;

1.

2.

3.

Note:

is

to

\,

The

1.

2.

3.

4.

After contain ed

by specified, tions 7 and 8 of number

12

of VOL 1 in 5

through and positions

Reinitializing

it

is

requi'red

The

disk was

A

defect

occurred

case,

initialization can be used

track

(s)

out

from

the

A

sector

sequence

on

the

disk

in

this

chapter

the

desired

It

is

not

be reused.

purpose

78,

of

To

write

all active

To

write

maximum

To

write All records in

track

00.

To

write

the

index

80

blanks each.

75

blank

the

number

of

the

sector 5 with a zero

positions 1 through

10,

the

a W

in

of

the

before

they

are

shipped

should

be avoided unless neces-

only

if:

exposed

of

spare

is

desired. See Initialization Procedures

sector

necessary

initialization is:

identification

tracks

the

bad

permissible

a record in each

are

80-character

track

characters.

sector 5 with

second

sector

position

first

to a strong

in

one

or

service

and add

area.

other

than

for

information

sequence.

to

reinitialize

fields,

on

a disk.

track

code

number

filled

with

records

is

written,

Sector 5 contains

If

one

of

the

first bad

a zero in position

bad

track

in position 13.

4,

sequence

80,

and

80.

magnetic

two

tracks. I n this

to

take

the

one

or

two

the

sequence

on

how

to

when a diskette

one

for

each

in defective

of

bad

tracks

sector

of

each active

the

blank

character

in

track

00.

sectors, 1

or

will be in

the

cO,de

blanks

through 4 and

ERMAP follow-

two

bad

tracks

track

will be in posi-

positions

Sector 7 contains

volume 10 in positions

is

in

positions

in

all remaining

to

a

field.

bad

tracks

existing

specify

sector

tracks.

is

9,

the

in

The

two.

track.

except

6

were

11

and

77

Sector 8 contains

•

HDR 1

in

• DATA in positions 6-9

•

~80

or

speci

fi

cati

•

01001

in positions

•

73026

in

•

01001

in

• blanks

Sectors 9 through following

•

• DATA

•

• 74001 in positions

•

• 74001

• Blanks

As a final

that

DO

R 1

Sector

~80

or

73026

it

is

in

content:

in

number

in

step,

written

the

following

positions 1-4

128

in

positions

on

29-33

positions

all

positions

in

positions 6-9

128

positions

in

all

35-39

75-79

other

positions

26

contain

1-4

in positions 10-11

in positions

29-33

35-39

75-79

other

positions

disk initialization checks

correctly.

25-27

deleted

25-27

data

set

depending

records

labels:

on

the

disk

the

with

to

input

the

see

Disk Initialization 51

INITIALIZATION

To

initialize

1.

2. Press

3.

the

disk,

I nsert a uninitialized, X R

Key

optional

•

diskette

mode

is

FUNCT

the

following

and

Volume

Sector

sequence

left

blank).

tions

being

Most

commonly

and

blank) arrangement

02

causes

25,

2,

4,

PROCEDURE

do

the

in drive 1. If

you

may

displayed.

SEL

lower,

data

can be left

I D in

positions

code

Valid

entries,

left

blank,

used are

02.

Entering

to

be

1,

the

sector

.... 24, 26.

following:

the

get

several disk

then

DELETE

(each

of

these

blank)

1-6

in positions

in

addition

are

shown

01

(same as being left

01

causes

2,

3,

4,

....

arrangement

disk

is

errors

fields

7-8

in Figure

the

25, 26.

to

bad

or

before

REC.

is

(normally

to

the

sector

Entering

be

1,

3,

posi-

25.

5, ....

• First bad

•

Second

• Blank in positions 13-14

• Blank length

4.

Press FUNCT

and

press

Note: If

only

the

Checking

bad

for

of

the

disk

in this

track

record

128 in

SEL I key.

numeric

checking

in positions 9-10

track

in positi

length

position

lower, hold

shift

function

chapter

.

of

15

key

ons

80

down

is

11-12

or L for

NUM SH 1FT

not

held

occurs.

record

down,

See

Disk

Blank

01

1 1 1

2

2 3 4 3 3 5 4

4 7

5

5 9 6

6 7 7 8 8 9

9

10

11

11 12 12 13 13 14

14 15 15 16 16 17 17 18 18

19 19

20

20 21

21 22

22 23 23 24

24 25 25 24 26 26

02

03 04 05

1 1 1 1 1

5 6 7 8 7 9 10

13

17

11

16

21

13 19 15 17 19 21 23 25 2 4 6 8 10 12 14 16 18 12 20 22

26

25 22

2 25

6 2

10 14

5

18

8 11

22 14

26 17

3 20

7 23

11

26

15

3

19

6

23

4

9

8 5 15

12

18

16

21

20 20

24 24

11 16 21 26 2 7 12 17 22 3

8

13 18 23 4 9 14 19 24

19 15

25

06

13 19

25 2 9 8

14

20 26

3 9

15

21 4

10

16

22

5

11

17

23

6

12

18

24

07

08

1

9

15

17

22

25

2

2 10

16

18

23

26

3

10

11

17

19

24

4

12

11

20

18

5

25

13

5

21

12

6 19 14 26

22 6 7 13 15 20

23 7

8 14

16 21

24

09

1 10 19 2

11 20 3 12 21 4 13 22 5 14 23 6 15 24 7

16 25 8

17 26 9

18

10

11

1

1 11

12

21

23 2

2

13

12

24

22 3

3 3 4

14

13

23

25 4

4

14

15

24

26

5

15

16

25

6 7 8

6

17

16

7

26

18

7

8 9

19

17

8

9 20

18

9

10

19

21

11

10

20

22 24 26

12

13

1 1

14

13

2

25

15

2 14

3

16

26

15

1,7 4 5 16

18 5 6

19

17

7

6

20

18

21

19

9

8

22

20

10 21

23

10

11 22

24

11

12

25

23

12 13

Figure 25. Disk Record Sequences

52

Any

or

all

of

the

data

in volume a blank field. sequence

26).

will scan

the fied, initialization

track

When positioned

ID

is

left

If

of

sectors will be

If

no

bad

tracks

the

disk

bad

track

code. When

code

and

will

the

initialization process

at

track

blank,

the

sector

are listed,

to

find

operations

try

to

00

and the label in

played unless errors were

the

following

Bad

•

code and second bad

•

Tracks data shown space. ber

is

displayed:

tracks

that

have been marked

are displayed in

10

show

the

first bad

track.

that

showed errors

line 2 beginning in

is

and

written

The

the

first

third

with

two

character

encountered:

step

3 may be left blank. If

the

volume

sequence

in

any

one

initialize all

ID

is

numeric

the

initialization

defective

or

two

do

not

check

is

complete,

will be

left blank,

order

tracks

bad

other

sector

encountered.

In case

with

the

first

data

line. Positions 9

track;

11

and 12 show

when

checked

cursor

position

three

characters followed

characters indicate

indicates

the

written

the

(1, 2,

3,

operations

marked

tracks

are speci-

for

the

bad

tracks.

the

disk

08

is

dis-

of

errors,

the

bad

track

are shown in

41.

Each

by

the

track

type

of

error

the

as

....

with

is

the

track

a

num-

25,

DISK CHECKING

The

initialization for

disk

tracks

feature

marked

tracks exhibiting errors. follows:

1.

Insert a

2.

Press FUNCT

3.

Press

4.

At

the

same zing. If errors are repeatedly repeated

diskette

the

end

of

format

and

operations

I key

the

as used

only

SEL

scan, a

reported,

tracks

should

provides a means

with

the

bad

The

procedure

into

drive 1

lower and

lower

report

is

posted

for

reporting

the

disk

that

show

be

considered

of

track

code

for

DELETE

on

errors

should

persistent

bad

checking a

and

checking

REC

the

display in

after

initiali-

be

checked

errors in

.

for

is

as

I Missing I D field

C CRC

error

(diskette

data

error)

S Deleted record

Only

10

tracks

with

encountered

in a track

If errors are displayed

was

not

successful.

errors can be displayed;

is

displayed.

after

initialization,

The

disk should

be

the

initialization

removed

first

to errors and initialization tried again until a successful tion

occurs. If particular tracks

those

successive retries,

tracks tive. Initialization can be retried by specifying in

the

keyed

data

of

step bad tracks errors

in

that

can be specified

more

than

two

tracks

show

persistent errors in

should be considered defec-

3.

Since

the

maximum

is

two,

disks

with

cannot

be used.

those

number

persistent

error

clear

opera-

tracks

of

Disk Initialization 53

Figure

initial

26

ization

Code

shows

errors.

the

errors

Type

and

recovery

action

Causes

for

disk

What You

Do

=

*

(

&

Input specification

Track

were

bad

Sequence

than A

0-9 tered ber tered 7-12.

Bad

track specification

Bad entered sequence.

Bad More tracks tracks

Write Disk

"

error

while initializing disk.

Sector

not deleted

One deleted on not

Sequence keyed

00

or

specified as a

track.

is

13.

character

or

blank

or

an

of

characters

in

positions

tracks

in ascending

than

are

on

error

of

the

sectors

the

index

deleted.

number

was 00.

78

to

greater

other

was en-

odd

num-

en-

are

not

two

bad

the

disk.

occurred

the

normally

(9-26)

track

99

than

was

Reset**

and

correct

error.

Reset* * and

re-enter

in ascending

sequence.

Reset**

and

retry

disk

initialization.

error

persists,

discard disk.

Reset**"

and

retry

initialization. Reset**

and

retry

initialization.

If

I

nitialization

**

the

initialization

Figu'j-e

26.

Disk

54

errors

Initialization

are

setup

Errors

not

must

reset

be

by

done

the

reset key.

over.

The

disk

is

removed

and

reinserted;

then

The

self-check

entry

in

numeric

check

digit.

The

field,

and

has been

algorithms,

In

the

check

a The numbers tor

is number an

error

Self-check fields the

following

H C

F

G

L

M-

modulus

digit

of

accounting

from

entering

requiring a

condition.

characters:

Modulus Modulus Modulus Modulus

Modulus Modulus

codes

or

feature

provides a

fields

that

self-check digit

precomputed

10

or

11

operation,

10

cannot

system

that

verifying

check

are

specified in

10 11 10

skip

11

skip

10

duplicate

11

duplicate

must

are

digit

method

contain a precomputed

is by

modulus

basic

be used as self-checking

be

adjusted

to

be self-checked.

check

digits

of

10,

the

last digit in

using

11.

numbers

to

and

the

program

for

checking

either

of

that

eliminate

uses a basic

machine

by

the

self-

the

two

require

numbers.

such

If

an opera-

indicates

use

of

Chapter 9. Self-Check Feature

I f self-check are:

1. Press

2.

3.

COMPUTING THE SELF-CHECK DIGIT

Modulus

Modulus 127

digits long.

errors

RESET

error

condition.

ter

or

backspacing

Press

the

error

condition,

the

high

Press N

UM

condition,

high

order

10

can be

occur,

to

unlock

This

dash

key

(b)

order

hex

SH I

FT

(b) overscore

hex

C,

computed

To

compute

three

the

permits

to

correct

with

either

overscore

D,

and

the & key

the

and

(c)

for

modulus

methods

keyboard

entry

a preceding

shift

the

(c)

exit

units

exit

from

any

number

units

to

position

10,

of

error

recovery

and

remove

of a new

key

from

(a) remove

self-check field.

do

charac-

character.

to

(a) remove

position

the

field.

with

from 2 to

the

following:

the

with

error the

Fields

defined

when

the

AUTO

self-check fields

Fields

defined

when

the

AUTO

self-check fields

When

duplicate

field,

the

self-check

If

a self-check

SKIP

switch

to

number.

Blank fields

a

C

error

self-check field

later in verify

Numerals 0 with totaled

. are

totaled

the

in

values 0

by

the

check

verify

through 9 and

as

by

the

DUP/SKIP

when

by

the

DUP/SKIP

when

or

skip

is

error

is

backspace,

correctly

or

field

to

be

mode.

through

low-order

the

value

characters F and G act

switch

is

on,

and

the

AUTO

DUP/SKIP

characters

it

is

and performed found,

skipped

~ero.

Land M act

switch

off.

self-check

after

turn

off

and

correct

in

the

correct

9 in

hex

mode.

in

enter

all

other

the

digit value. All

is

on

and

are

combined

the

AUTO

the

enter

mode,

This

mode

EBCDIC

low-order

as

skip

as

manual

switch

as

dup

as

manual

auto

function.

DUP/

self-check

but

allows a

and

entered

characters

hex

digit are

other

fields

is

off.

fields

in a

cause

characters

1.

2.

3.

The

Multiply position digit,

by

Add

the

basic

number

Subtract ending

difference

the

of

the

2.

digits in

the

in

zero.

is

the

units

position

basic

number,·excluding

the

products

that

were

not

sum

from

the

self-check digit.

and

every

to

the

multiplied.

alternate

the

digits in

number

self-check

the

Self-Check Feature

55

For

Basic

example:

number

6 2 4 8

Modulus

To

compute

11

modulus

11,

do

the

following:

Units position

alternate

basic

Multiply

Digits

Add

Next in

Subtract

Self-check digit

0.

position

number

not

multiplied

higher

number

and

every

of

ending

6 2 8

12

1+2+1+4+4+1+6=19

4

20.

-19

16

Assign a weighting

1.

basic

etc.

starting excluding toward

Multiply each digit

2.

Add

Divide this

Subtract

difference

example:

Basic

number

Multiply

Add

the

3.

4.

5.

The

For

Weighting

number.

with

the

self-check digit,

the

high-order digH.

products.

sum

the

remainder

is

the

factors

factor

to

each digit

These

weighting factors are

the

units

position

by

its weighting

by

11.

from

11.

self-check digit.

2

5 4

6

10.

6

6+10.+12+12+10.=50.

of

and

progressing

factor.

3

12 12

position

2-7,2-7,

the

number,

4 5

3 2

10.

of

the

Divide

Subtract

Self-check digit

50711=4

11-6=5

5

plus a

remainder

of

6

56

The

3741 Models 2 terminals or on chronous, data

for

nonswitched

serial-by-bit, serial-by-character.

transmission using EBCDIC

nications line

The

3741 Models 2 via

appropriate

•

Switched or

2400

bps.

and

point-to-point

facilities,

facilities.

code.

and 4 operate

modems

common-carrier

4 are

supported

communications

or

multipoint

Operation

directly

in half-duplex

over

the

following

network

as

standard

on

switched

communications

is

half-duplex, syn-

The

BSC allows

as

the

commu-

mode

networks:

at

600,

1200,

BSC

2000,

Chapter 10. Communications

The

private-line

point-to-point. in half-duplex mended

to

publications, General Information Binary Synchronous

Communications, Systems Summary,

pertaining

The

exact

4

depends

typical

configurations.

channels Although

mode,

duplex

minimize

line-turnaround

GA27-3004,

GA24-3090,

to

communications

network

upon

configuration

the

application.

may

be

half-duplex

the

3741 Models 2

or

duplex,

and 4 operate

private-line facilities are recom-

and

for

times.

IBM

additional

Refer

to

Teleprocessing

information

facilities.

of

the

3741

Model 2

Figure

27

shows

some

the

or

• Nonswitched data

channels

at

600,

1200

Note:

The

grade

tioning

must

common-carrier,

(or

equivalent

or

2400

bps.

of

channel

be as specified

voice-grade, private-line

privately

and

by

type

the

owned

of

channel

modem

facilities)

supplier.

condi-

Communications 57

IBM

3741

Model 2

or

2701

2703

,--

,

Data

Processing

Unit

I

4

a.---

___

---'

1/2"

tape

@

I Diskette

Il 6 .

f--LJ

~--

Station

IBM

3741

Model 2

Diskette

or

IBM3747 Data Converter

4

/

~

f.___

""",-=:::::;~~~~I

IBM

3747

Data

Converter

I

'

I Diskette

- f 6

-,

mskette

,/

"

Data

Station

~~-riiiiiiiii--

1_.~

Data

Station

/'

Data

Station

==---~

,

, Diskette

1/2it

tape

@

I

, 6

,

r-

f

I

~~---r.;;;;~_

Data

Station

Model 1

Figure

27

(Part 1

of

2).

3741

Model 2 or 4 Communications

58

or

3

Configurations

Processing

Unit

1_-

Data

Station

Nonswitched Common Carrier, Voice Grade

Model 2

System/3

A

Figure

27

(Part 2

of

2). 3741 Model 2 Configurations

Networks

The

3741 can use a switched

point-to-point

mUltipoint communications. See Figures

communications

or

3741 Model 2

or

4 Communications

or

nonswitched

or

nonswitched

4

--I

--:;l

network

28

and

. I

l~~

Li-

or

4

for

29.

A nonswitched, sists

of

dedicated, private,

Nonswitched Model 2 or 4 with Nonswitched Model 2 network, the continuously established during which data may be Since the terminals are is

or

cjrcuits making

required.

point-to-point

remote

multipoint

4 with a processing unit. On a

the

terminals are physically

up

the

continuously

or

multipoint

or

leased

communication

networks

terminals

networks

communication

for

transmitted

or

connect

predetermined

connected,

network

connect

processing units.

connected:

over

the

3741

the

3741

nonswitched

that

lines are

time

periods

the

lines.

no

con-

lines.

is,

dialing

Point-to-Point Nonswitched Network

3741 Model 2

Point-to-Point Switched Network

3741 Model 2

Figure

or

4

or

4

28.

Point-to-Point Telecommunications

Modem

Networks

Modem

3741 Model 2 or

4,

3747,

or

Processing Unit

3741 Model 2 or

4,

3747,

or

Processing Unit

3741 Model 2 or

4,

3747,

or

Processing Unit

3741 Model 2 or

4,

3747,

or

Processing Unit

Communications

59

Switched Common Carrier

A

switched

communicate

units

The

terminals

mon

A

complete tween transmission

by

dialing

or

processing

network

without

allows

with

many requiring are

connnected

dedicated

carrier exchanges servicing

and

continuous

terminals

takes

the

telephone

only

place.

for

unit.

the

3741 Model 2

other

terminals

by access lines

their

data

the

period

The

connection

number

or 4 to

or

processing

communication

to

respective locations.

path

is

established be-

of

time

in

which

is

established

of

the

remote

terminal

the

lines.

com-

data

the

Normally,

station On switched lines, call,

the

M key

must calling, regardless controller pressing Pressing answering a

and

that

of

the

to

wait the M key the

M key

call

or

placing

the

call should bid

and

if

the

operator

be pressed. This indicates

the

controller

mode.

for

a line bid. (The

is

shown

must

if

on

will

transmit

Not

pressing

in Figure

be

omitted

nonswitched

if

the

will be dialing

who

a line bid first

the M key

tells requirement 44

[Part 3

the

of

3741 will be

lines.

line. the

is

the

for

5].)

Processing

Unit

Modem

3741 Model

Modem

2

or

4

3741 Model

Modem

2

or

4

~----------~------------~------------~-----

Modem

Figure 29. Leased Multipoint Telecommunications Network

60

3741

Model 2

or

4

Modem (Data Set)

An external nects available are A selectable in

the munications modem

A

synchronous modems (see

Features).

modem

the

terminal

1200,

600

United States, Canada

adapter

and

the

IBM

clock

that

do

or

integrated

to

the

telephone

2000,

and

2400

bps transmission

and

i~

compatible

integrated

not

feature

have

is

available for use

their

own

1200

bps

lines.

The

bits per

rate

is

available

Japan.

1200

The

with

the

bps

modem.

internal clocking

modem

bit

rates

second

except

3741 com-

IBM

3872

with

con-

(bps).

FEATURES

The

following features are available for

and

4.

2

Synchronous

The

synchronous

clocking

The

bit

in

the

should

provide its

communicating

machine clocking.

of

the

rate

United

be used

own

Clock

data

for

this

States,

only

clocking. with

clock

feature

onto

feature

Canada and

when

must

and

is

the

The

also be

the

3741 Models

provides business

off

of

the

transmission line.

1200

bps

(600/1200

Japan).

attached

terminal

equipped

This modem that

with

feature

does

the

machine

except

not

3741

business

is

The

modem supplied by and

must modem istics as specified by tionally interface. cable plug. used by

Connector Pin

*Used

required

I BM,

the

be identical

interface

compatible

that

The

the

4 5

7

15*

17*

18 20 22 23

must

Attachment

is

terminated

following circuits described in RS-232C are

3741 Models 2

2 3

6

only

when

by

the

3741 Model 2

common

on

both

conform

EI A Standard

with

the

3741 Model 2

is

made

by a 25-pin

and

RS232C

Designation

AA

BA BB CA CB CC AB

DB

DO

None

CD CE CH

operating

or 4 may

carrier,

ends

or

the

of

the

network.

to

the

electrical character-

RS-232C

or 4 modem

via a

modem

4:

Circuit Description

Protective

Transmitted

Received

Request Clear Data Signal return) Transmit

timing

Receiver signal

timing

IBM Data Ring

Data Signal rate

with

connector

data

to

send

set ready

ground

signal

3872

wrap terminal indicator

synchronous

customer

and

be

opera-

interface

ground

data

send

(common

element

test

ready

selector

modems.

be

The

Terminal

The terminal identification feature

network

Transmitting the Terminal Identification Sequence

The sequence a line bid.

If

the a switched is

the

Identification

terminal identification

identification

sequence

cannot

BSC

3741

following sequence:

PPPSS

be installed if

is

utilized.

terminal

when

transmits

initiating a line bid

is

the

calling

network

EP

after a connection

feature

sequence

with a keyed-in sequence. This

a 4-character

station,

transmits a 4-character

and

compares

the

multipoint

identification

or

when

responding

the

first transmission

has been established

a received

communication

AAAYYvabcNA

DPDNN'~~

The

lowercase v A

(hex A5) terminal character

Models 2

the

If

receiving a line bid

type

3741 is

is

the

(3741

and

the

4).

called

unique

3-character will be a factory-installed assigned The ters

EBCDIC

tion

ENO, ETB, IUS, NUL,

station,

is-

the

by I BM

master

from

code

of

SOH,

ACK,

the

following

list consists

all positions

set

STX,

OLE,

first transmission

sequence:

sequence

from a master

of

with

the

ETX, EOT,

NAK,

DEL,

and

to

on

sequence

list.

charac-

the

excep-

SYN,

EO.

after

Additional your

modem-interface

IBM

representative.

information

is

available

from

PPPSS

A P

AAAYYvabcCOA

DDDNN

K D

Commu'nications

61

If

the

terminal

following sequence

PPPSS

is

not

prepared

is

transmitted:

NP

to

receive a line bid,

AAAYYvabcAA

DDDNN

Remote Terminal Identification Compare

This

function

to

check

the

identity

ing with or 4 and of

quence received

mission

minal identification sequence matches character acter

The sequence while

mode. A sequence

tioned

record the the keyed,

identification sequence transmission terminal identification feature were cursor characters have been keyed, an

FUNCT

Note: If

tains characters (for example, lower case must

After operator modes by pressing mode

sequence

program buffer 9 buffer 9

tions feature.) This sequence

terminal

When

pares bit

match to and an X error. transmits its

'with

62

data the

remote

characters

or

reception

and

has

operator

with

the

buffer

last character

first position, indicating

the

SSC terminal accepts

or

is

left in a position indicating

SEL

and

the

enter

the

identification characters have been keyed,

places

key.

The

is

transferred

is

not

is

in a

the

terminal

the

identification sequence

with

the

operator

and

the

transmit

or

the

response

a C error.

If

line bid

KD

allows

the

operator

of a remote

communications

terminal. An

is

compared

on

the

identical length as

keys

the

first character in position 1

and

the

of

reception

COMM

remote

not

hexadecimal equivalent using

the

keyed remote terminal identification

and

used if

communications

response

receive data blocks. If

is

the

sequences

to

the

communications line.

of

data begins after

remote station of

FUNCT SEL, COMM, and

is

up

to

cursor

the

sequence. If

of

up

of

are pressed.

terminal identification sequence con-

represented

al

3741

in

from

erased from

you

have

the

calling

keyed sequence. If

is

positive,

negative,

up

to

of

a 3741 Model 2

terminal before proceed-

between

a terminal identification

terminal identification

in

the

15 characters must be posi-

in

the

that

any

to

15 characters, and

data

error

on

pha characters),

one

of

the

is

stored

station,

the do

not

14 times before disconnecting

the

3741 Model 2

operator

the

update

occurs as

not

that

the

current

the

expanded

mode.

of

the

terminal disconnects with

match,

keyed sequence

the

keyed sequence.

or

of

position following

the

cursor

remote terminal

though

installed. If

more than, 15

is

displayed after

3741 keyboard

the

communication

record buffer

display. (Program

as long

the

terminal com-

response

the

terminal prepares

the

sequences match

the

or

se-

The

trans-

received ter-

for

char-

read index

the

current

is

left

in

the

operator

the

HEX key.

the

desired

to

communica-

as

the·

to

its line

sequences

terminal

When

the

terminal identification sequence to

the

operator

the

terminal gives a positive response and prepares

mit

or

receive

the

terminal does

for a

valid sequence.

Note: Program buffer 9

4

Identification Feature previously communications

-if

you

Operator

This feature and to

accept passed if terminal. This

When

letter B The the erased and detected, again.

For the GC21-5071.

Note: Program buffer 9

Identification Card Reader any displaced during communications functions. (Program buffer 9 is tions feature

point

Keylock

This feature controls

In

the used and terminal can also be locked permitting communication with a remote terminal. However, be

used

is

removed, communications

stored

have

Identification Card Reader

transmit

only

the

3741 terminal

is

displayed

operator

card reader.

the

no action

information on

IBM

3740

program previously stored in program buffer 9

feature.)

locked position communication

in

once

the

to

permit re-entry. Also, if

is

the

called

station,

of

the

received line bid

keyed sequence. If

data

blocks. If

not

respond,

in

program buffer 9

functions. Program buffer 9

the

expanded

is

used

to

the

information

valid sequences. This feature can be by-

3741 terminal

is

done

to

must

then

After

terminal

is

recorded and

the

BTAM/TCAM

not

used if

or

the

expanded

the

unlocked position it can be used.

3741

is

the

but

is

used whenever

is

installed. Therefore, any program

communications

read an

by pressing record advance.

the

you

removed from COMM,

operator

to

is

transmitting

is

in

one

the

right

insert

the

card has been read,

is

ready

format

of

Programmer's Guide,

is

used whenever

Feature

have

communications/multi-

use

of

in a communications

mode

the

remote

the

sequences match,

sequences

does

a CPU

of

the

of

the

identification card into

to

transmit; if an error

the

is

the

expanded

the

communication mode.

the

is

do

continue

the

is

displaced during

feature.

identification card

that

is

to

another

transmit

mode indicator.

card may be read

magnetic stripe, see

the

installed. Therefore,

mode

cannot

first

or

discontinued.

terminal

is

compared

to

trans-

not

match,

to

wait

Terminal

is

not

used

programmed

modes, a

the B is

is

Operator

is

communica-

be

The

3741

mode

the

key

must

second disk

Expanded

Communications

Feature

A

transmit

selected fields program

is

defined

as

follows:

This feature provides

for

the

3741 Models 2

• Expanded buffer (512 bytes).

•

Transmit

• Transmit selected records.

• Receive and insert

• Unattended printing

• Unattended ACL program communications

Expanded

Adding you

to

The

buffers used tions buffer the

field totals

or

all

is

selected. On buffers 1 ensure shows munications feature. See Communications Modes for a description

selected field.

Buffer

the

expanded

transmit

function

of

these buffers

through

that

no secure

the

buffers used when

of

the

following additional

and

4:

constants

after

(Model 4

communications

and receive

to

accomplish

are program buffers 1

accumulator

is

lost

completion

7 should be cleared by

or

sensitive

expanded

and blanks.

completion

execution

only).

data

the

buffer. when

of

communications,

you

communications

functions

of

communications.

after

completion

feature enables

using a 512-byte buffer.

expanded

The

communications

data

remains. Figure

have

contents

the

expanded

communica-

through

of

mode

program

operator

modes.

7 and

some

com-

to

30

• Position 1 apostrophe

ition 1

trophe

record

• Additional the data

of

absence corresponding positions

be selected

The

transmit

program buffers 8, 9,

considerations concerning

buffers.

fields:

Diskette Data Record PUBLIC,

Program Buffer Transmitted

Diskette Data Record PUBLIC, Program Buffer

Transmitted

Transmit Selected Records

of

the

program

(').

The

of

the

data

means

the

character

is

not

to

be

quotes

characters

record are

The

in

the

to

of

quotes

for

transmission.

selected fields program can be loaded

following are examples

Contents

Data PUBLIC,

Contents

Data

must

have a

quote

(")

or

an

quote

means

the

character

record

is

to

be

transmitted;

in

position 1

transmitted.

placed

in

the

program indicate

corresponding

be selected for transmission.

in

the

program indicates

of

the

or

A.

See Program

the

loading

data

of

positions

record are

of

transmit

Control

these program

JOHN

""""""""""''''''l6l6l6l6l6~

of

the

of

that

selected

602154

in pos-

an apos-

data

that

the The the

not

to

into

for

JOHN

'~~~~W¢~~~~~~""""""

602154

Transmit Selected Fields

The

expanded transmit to

be

transmitted

set

by loading a special program buffer before teleprocess-

ing

is

initiated.

byte

buffer before transmission occurs. See Expanded

Communications Transmit Mode munications Transmit/Receive Mode (K)

of

how

Note: Machines

feature

communications

selected fields within records

are selected

The

selected fields are packed into

the

fields are packed

without

cannot

receive selected fields.

feature enables

from

into

the

expanded

of

a data set. Fields

the

records in a

(J)

or

Expanded Com-

for

the

512-byte

communications

you

a description

buffer.

to

data

the

512-

The

expanded

transmit

transmitted

special

transmit processing packed See Expanded Communications Transmit Mode (J)

Expanded Communications Transmit/Receive Mode (K)

for a description

512-byte buffer.

Note: Machines

feature

communications

selected records

are selected from

selected records program, before tele-

is

initiated.

into

512-byte

on

without

cannot

receive selected records.

from a data

The

buffer

how

the

feature

the

records

before

records are packed

expanded

enables

set. Records

data

set

by loading a

that

are selected are

transmission occurs.

communications

you

into

to

or

the

be

Communications

63

A

transmit

sign

remainder (the order equal signs no

search

The

selected records program

(=) in

the

first position

of

the

program consists

data

in

the

record

to

be selected

represent

argument

transmit

selected records program can be loaded program buffers 8, 9, considerations

buffers.

The

concerning

following

records:

of

must

for

transmission)

"don't

in

position ,

or

A.

the

is

an example

is

defined

by

a program buffer.

of

match

care"

a search

the

and

positions).

of

the

argument

search

argument

equal signs (the

There

program buffer.

See Program Control

loading

of

these

of

transmit

program

an equal

The

in

can be

into

for

selected

Data Record Buffer

Content

Trans.

Data

~~~~OOl~~~~ROCHESTER~MN~~~~124

===========ROCHESTER~MN=======

~~~~OOl~~~~ROCHESTER~MN~~~~124

OPERATION

Transmit

Receive

'28

data

characters

256

data

characters

384

data

characters

5'2

data

characters

F

= field

totals

accumulator

Nu

merics = program buffers

Notes:

,.

Program

2. When operator instead

buffers

the

expanded

I D card read

of

program

features.

3.

The

last

data

placed

transmission

reload

is

complete.

them

with programs as required.

buffer

not

listed are

communications

feature

buffer 9 for

into

these

The

MODE

T,

P,

B,

or

D

J

or

K

R,

B,

D,

or

K

not

affected

by

feature

are

installed,

terminal

ID

the

or

buffers remains in

operator

must

BUFFERS

F

F,',2,3,4,5, 6,

F, F, " 2,5,6

F,',2,4,5,6 F,

this specific

and

the

terminal I D

the

buffers

clear

these

USED

and

7

I

2and

6

" 2, 3, 4, 5, 6, 7

operation.

or

buffer

is

used

ID

card

reader

after

buffers

and

Figure 30.

64

Buffers

Used

by

the

Expanded Communications

Buffer

Feature

Receive

The receive

The and data constants is is program. the line

to

licate information

on

program

position tains of greater-than signs in ber blank position length.

The receive ed into program buffers 8, 9, for

buffers.

and

Data

and Insert Constants

expanded

position where

the

and

initiated. A receive defined by a greater-than sign

positions

is

to

a greater-than sign in

disk

data

of

characters received 'per record. Also,

considerations concerning

inserting

communications

data

and insert

position and

blanks

is

program

The

greater-than sign

into

be inserted.

in

that

data

must

contain

of

the

data

from

the

in

the

data

and insert

The

following constants.

constants

the

received fields are

content

defined by a receive data

that

is

loaded before teleprocessing

data

and

which data

~AII

characters

the

program are considered dup-

and

are placed

set. Since

the

greater-than sign,

record

written

communications

the

program

program buffer indicates record

constants

is

an example

feature enables

into

a new record.

to

of

the

constant

insert

constants

(»

in

position 1

is

also used

from

the

communications

not

corresponding

in

every record

the

first position

on disk always con-

line.

The

must

equal

program can be load-

or

A.

See Program Control

the

loading

of

receiving

you

be inserted

duplicate

and

insert

program

of

to

indicate

written

of

the

first

number

the

last non-

program

data

to

a

num-

Unattended Printing

The

expanded unattended Model 2 up

the upper and COMM, followed by FUNCT PRINT TO EOD,

AUTO R sequence causes a P

first

data

error-free receive

ing

to

the

control

before

lected

If a

3713

be

on

disk 1 for

set

is

continued

in

order

I f a

3715

data set

(disk 1

plete data

Upon completion 2 and 4 will reset from disk 1 and receiving

communications

printing

or

4 has a printer

unattended

EC

ADV switch

set received

contents

program

entering

is

attached

unattended on

to

print

the

or

3717

is

printed

or

disk 2). If set

is

printed

after

a receive

attached.

printing

then

operation.

of

is

to

disk 2,

is

unattended,

of

to

sector 7 of

function

use

the

appropriate

must

be set

to

be displayed

is

printed

Printing

program buffer A. If

be manually selected,

communications

to

the

3741,

printing

operator

continuation.

attached

the

unattended

to

no

data

set

even if it

on

disk

disk 1

feature

operation

The by keying FUNCT

in

after

the

to

intervention

the

3741,

matter

starts

continues

printing,

2.

enables

if

operator

SEL

upper

mode

at

ON.

The

position 37.

completion

is

formatted

the

it

must

mode.

first

data

occur. If a

the

fi

where it

on

disk 1,

on

disk 2.

the

3741 Models

after

transmitting

you

to

have

your

3741

can

set

SEL

and

key.

The

keying

The

of

an

accord-

format

be se-

set

must data

is

required

rst received

is

located

the

com-

Receive Data

Program Buffer

Record Written

Content

to

Disk

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Communications

65

Unattended

The

expanded

unattended

of

communications. tended SE L

upper

appropriate

Sector 3 of mation Figure 31 lists Figure

ACL

communications

ACL program

and

COMM,

mode

the

index

required

the

32

lists

the

Position Required

2-9

10

Source

1

source 12-19 20

Object

1 ject

21

The

Program Execution (Model 4 Only)

execution

The

operator

execution

the

character

feature

after

can

set

function

E,

enables

you

the

completion

up

the

by

keying FUNCT

and

then

unat-

key.

track

of

disk 1

must

contain

to

translate information information

or

execute

required

an ACL program.

for

translation

for

execution.

Information

data

set

name.

or 2 depending

data data

or 2 depending

data

set

character

set

is

set

name.

is

mounted

A.

on

which disk drive

mounted.

on

the

Default

disk drive

on.

Default

the

to

is

the

1.

ob-

1.

have

infor-

and

Program

For

that

Control

the

expanded

communications

program buffers 8, selected fields programs, and

receive

data

and

insert

of

three

data

sets can be program loaded

For

control.

into

example,

Each

a program

if program buffers 8, 9,

follows:

8

9

A

The the the the and all

would

during

III"

=16~16EF

+~16T~2

first

transmitted transmit second transmit

subsequent

mitted

without

be

printed

buffer

A if

communication

It

'~~

•••••

data

selected fields program (program

transmitted

selected records program (program

transmitted

program

unattended

the

operator

feature,

9,

and

A are used

transmit

selected records programs,

constants

transmhted

communications

buffer

applies

(transmit (transmit (printer

set

would

data

set

would

data

sets

control.

selected

The

under

print

control

selection.

it

to

store

and

blanks. A

and/or

received

program

only

to

one

and

A are loaded as

selected fields) selected records)

program)

be

under

be

under

would

first

data

of

unattended

is

assumed

transmit

maximum

that

data

control

buffer

control buffer

be trans-

received

program

mode

under

is

set.

of

8), of

9)'

Figure

31. I nformation

Position

2-9 10

12-15

21

Figure 32. I

.

After

communications

I

shifted

one

ACL program

Required

Object

1

or 2 depending

object

Information

data

ACL program name.

The

character

nformation

position

Required

is

to

the

translation

complete,

or

for

Translation

set

name.

on

set

is

mounted.

E.

for

left

and

execution

which disk drive

Default

Execution

the

data

in

displayed.

is

initiated.

the

is

1.

sector 3 is

Then

the

Program buffers

communication

.mode

is

selected again,

if

after

communications these buffers, programs receive

Figure

data

33

program buffers used

munications

Note

that a transmit

not

follow a receive

order

for

Expanded

8,

9,

and

A remain active

is

they

(transmit

and

insert

shows

the

and

the

complete.

should

selected fields,

possible relationships

for

data

That

these

buffers are used again. Therefore,

is

complete

be cleared

constants,

the

functions

sets

transmitted

selected fields

data

and

insert

buffers

to

be used.

Communications/Multipoint

Feature

This

feature

Expanded Communications Feature

following additional

• Nonswitched

provides all

functions

multipoint

of

the

functions

for

communications

after

is, if

communications

you

will

of

any

transmit

or

selected records,

print

unattended).

between

of

expanded and/or

or

records program

constants

Data

described

and

also provides

the

3741 Models 2

the

current

not

be using

communications

the

com-

received.

must

program

Link

in

Control

under

the

and

4 .

capability.

66

• Inquiry

capability

under

multipoint

data

link

control.

Multipoint

Communications

Inquiry

Multipoint terminal devices on a dedicated work only serves as a

monitor and selecting sequences

mode, When in receive mode, a positive acknowledgement. If receive, it responds with a negative selection. When the

operator cessing placed when polled, it responds with EOT. If

transmit

communications

to

network.

the

line

at

the

3741 responds

the

is

also

unit

has data

in

receive mode. If

and

is

selected, it responds with RVI.

allows

communicate

The

3741

tributary

all

times

the

3741

notified

to

send

Program Buffer 8 Program Buffer 9 Program Buffer A

station.

and

as

appropriate. When in

to

a poll by

3741 responds

is

not

(a

tone

and

the

3741

the

with a processing.

on a multipoint

respond

the

3741

acknowledgement

in

communications

is

that

3741 and

The

3741 can

to

its

transmitting

to

selection with

is

not

heard)

that

the

3741

is

not

ready

the

3741

other

unit

net-

own

polling

transmit

data.

ready

the

should

to

transmit

is

ready

T

- -

-

T

- - T

to

mode,

pro-

be

to

T

- T

-

This

function Data Link Control Feature allows single record inquiry message, remote Both

the a data set See

Inquiry

information.

PROGRAM TYPE

T T R

-

T

- T - R

T

T T

- - R - R R T T - T T R R

-

of

the

Expanded

processing

inquiry message

on

R R -R R -T

-

- R R R -

R

disk

Mode

IN

unit

and

can be displayed by

(I)

and

PROGRAM

Communication·s

the

operator

transmit

and

receive a response

and

the

Operating Procedures for

BUFFER

T R T

R R

the

inquiry

response are

the

-

R R -T T

R R -T R R T R R T

Multipoint

to

key a

to

a

to

the

inquiry.

recorded

operator.

more

T T T R

in

Program Buffer

Number

Controllin

T A R A receive

- - Program

kS

Note:

if

communications of cess,

First

Transmitted

Second

Third

g

First Received Data

Second.Received Data

Third Received Data

program. Any

The

data. Therefore, if these program buffers are

their

Transmitted

transmit

buffer

data

contents

selected fields

data

sets

Data

Set

Data

Set

or

and insert

does

transmitted

of

program buffers 8, 9, and A remain active

mode

should be deleted.

constants

not

contain a transmit

or

is

again selected, these buffers would be used

8 9 A 8

Set

records program.

program

received are

9

8 8 8 8 9 8 8

9

selected fields, records,

not

9 9

A

8 9 A 8 9 8 8 9 A

9

A A 9 A

or

receive

under

program

required

after

control.

after

communications in

controlling

their

initial use

A

data

for

the

one

9 8 8 8 8

AA

and insert

is

complete.

transmitting

communications

constants

9

That

or

receiving

8

9 9 8

A

is,

pro-

Figure 33. Expanded Communications Program

Buffer

Usage

Communications 67

Programming

Teleprocessing programming

3741 Models 2 and 4 by operating systems:

System/370

DOS/VS DOS/VS DOS/VS CICS

. DOS/POWER/VS

OS/VS OS/VSTCAM OS/VS

OS/VS CICS

OS/VS1/RES OS/VS2/JES2

In

addition

used as an RJE (remote job entry)

JES2

or can communicate with either a 3741 Model 2

The 3741 essing and System/360-370 OS Models 2 and 4 are transparent through the device classes BSC1, BSC2, and BSC3

Support

support

the

following access methods and

System/3 Disk Systems

BTAM VTAM

BTAM

VTAM

to

this programming support, the 3741 can be

POWER/VSRJE. Also,

or

4.

Models 2 and 4 are transparent

support

that

exists

RPG

IBM

Emulation program (EP) Network

3747

in

System/360-370 DOS

BTAM

in

BTAM

is

provided for

II

3704/3705

control program (NCP)

terminal controlled by

the

3741 Models 2 and 4 with BSCA

and TeAM. The 3741

and TCAM.

to

the

or

another

teleproc-

BTAM

the

of

In

BTAM

and TeAM, the terminal designation

or BSC3 depending on whether a nonswitched

BSC2, switched facility signation nation

is

BSCA on the file description specification and

blank

in

the remote device field of the telecommunications

speci ficati ons.

COMMUNICATION MODES

The 3741 can transmit receive information and store it on a disk,

information on the rest tion and can consist of

..--------

~--------

~--

then

-------------------~-------------------

or or

is

being used.

is

3740.

In

System/3

all

on

part

of

a disk and then receive information

of

the

disk. The 3741 cannot receive informa-

transmit. Transmit and receive operations

single or multiple data sets.

1898 Records maximum

T ransm it

----il~~.~.t__--

In

VTAM,

RPG

II, the terminal desig-

the

information on a disk,

One disk

Transmit----------1~

Receive--------~

Then

I

the

terminal de-

or

transmit

Receive

is

BSC1,

---t~

or

is

the

Because available:

Communications with

•

of

this capability,

System/370

DOSBTAM OSBTAM OS

TCAM (level 5)

IBM

System/370 via:

IBM

2701

D_ata

Adapter Unit

IBM

2703

Transmission Control Unit

IBM

3704

and

IBM

3705

Communications Adapter NCP mode IBM

System/370

(Integrated Communications Adapter)

IBM

System/360

IBM

2701 Data Adapter Unit

IBM

2703

Transmission Control Unit

IBM

3704

and

IBM

3705

Communications Adapter mode only

the

following support

System/360-370 can be:

Models 135, 125

via:

System/360

DOSBTAM

OS

BTAM

OS

TeAM (level 5)

in

emulator

or

115

in

emulator

via

an

the

is

also

With with one disk are when operating and transmitting from disk 2, can from disk

/

..

or

ICA

14----Receive

-Transmit~""-----+-Receive--------1~

or

.,..---Transmit

second disk feature,

available across two disks. However,

in

the

only be a continuation

1.

___

--

----------+----Transmit

or

..

3;.;.,7-=-96

Disk 1 Disk 2

~

-----+---------~

---+---

the

same functions offered

combined transmit/receive mode

the

data being transmitted

of

the

last data set transmitted

Records maximum

~

,r

Then

.....

i4-Receive

~

This data must be

a continuation the last data set transmitted on

1.

disk

--

~

--

Then

of

,

.....

68

The binary to

determine transmission to

be used

or

which

and which

synchronous

which

(transmit

to

identify

data

set

labels are set

data

set

communications

data

set

mode), which

data

sets received (receive mode),

labels are

up

for

to

be used

feature checks

set

up

data

set

data

set

to

identify

sets received (transmit/receive mode). Figure

marizes

the

The following

Transmit

Transmit mode two location. Transmission begins with record selected labels unless is

After loading the COMM, of

the

effect

of

various BSCA modes.

further

Mode (T)

is

used

disks (if

the

second

and

continues

the

labels are deleted, bypassed,

detected.

the

disks

3741 in

the

transmit

and

display

T. A T will

to

indicate

data

set

label

status

on

describes

to

disk feature

to

mode

the

individual BSCA modes.

transmit

be

data

is

installed)

the

first

to

the

end

transmitted,

from

of

an

by pressing FUNCT SE L upper,

then

be displayed

the

transmit

on

mode.

for

data

labels are

transmission

data

34

sum-

data

sets

one

disk

to

a remote

data

set

the

data

or

a label error

operator

the

status

set

in

or

label

set

places

or

line

If

transmission occurs with no errors, a

the

display's sion. error

occurs, TI will be displayed

to

indicate an

dicator

a

telephone would if a line check, error occurred), will retransmit original call. However,

Model 2, if data set record displayed, disk

to

field upgraded so

position your I BM

3741 has unattended munications

If you

character this unique

status

line

to

If

a disk error, invalid

incompleted

is

TT

or

TI,

the

3741 will

call. If

the

mode indicator remains T (as it

remote

the

3741 will answer a

the

data beginning

on

the

communications

the

original starting position.

that

the

disk

to

the

original starting position.

representative

not

been field upgraded

intend

as

operations,

mode

to

data

condition

it

be selected while

use any

in position 1

is

reserved for initiating a BSCA diag-

indicate a

data

transmission. If

abort,

early

shipmentsof

mode was selected

the

operator

for

more information. If

is

recommended

transmit

of

nostic procedure.

TT

is

completed

set label,

in

the

display's

not

automatically

or

message

telephone

at

the

same place as

displayed

transmis-

or a transparency

the

mode

aborted

the

status

answer

call

3741

on

line

in-

and

the

with

must reposition

Your

3741

does

not

have

can

to

the

be

re-

Contact

your

and

you

are

performing

that

the

com-

the

label

is

displayed.

mode,

do

not

write a %

disk address 01001 since

a

When

the

telephone

transmit

The

procedure

ting

one

desires

to

disk,

the

any

data

sequently

3741

is

in

transmit

line

through a modem,

data

from

the

in

the

previous paragraph was for transmit-

or

two

disks in

start

transmission from any position

operator

set

start

with

the

can position

normal key

transmission

disk

their

mode,

to

the

entirety. If

the

entry

it

can be

connected

and

subsequently

remote location.

the

operator

on

disk

to

any

record

operations, and sub-

of

data

from

that

the

first of

point.

to

Expanded

The to

the records are last

I

RS end position in receiving system. Records are read byte not spanned system's reference manual

The as

data data ency mitted transparent

The separate block mat

Communications

expanded

transmit

character

communications

mode

(T)

transmitted

of

each record

in

(inter-record separator)

of

that

record.

the

buffer until a

be

contained

between

IRS (X'1 E')

in

the J mode

link

control

error

results.

in

transmit

(P),

operator

of this

block

The I RS

512-byte

buffer

complete

in

the

buffer. Thus, records are

transmission blocks. Refer

and

IFS (X'1C') characters

of

operation.

characters are read

The I RS

(T), transmit/receive (B), transmit-

or

transmit-transparent/receive

identification card

without

a following I

is

described in

Transmit

Mode (J)

transmit

of

operation

except

each transmission block.

in

the

buffer

character

and

is

which defines

occupies a

transmitted

from

record

and

for

more

information.

If

these

from

or

I FS

character

data

is

RS

the

IBM 3740

TeAM Programmer's Guide, GC21-5071.

mode

(J)

is

that

multiple

is

followed by an

byte

to

disk

into

the

I RS

character

not

to

the

cannot

or

any

disk, a transpar-

can be trans-

(0)

transmitted character.

The

BTAM/

similar

The

the

512-

can-

host

be

sent

other

mode.

as

a

for-

Communications

69

Transmit-Transparent

The

transmit-transparent communication data.

After

3741

in a

SEL

upper,

the

status

transparent

lines all

loading

transmit-transparent

COMM,

line

of

the

mode.

Mode

256

the

disks, an

and

P.

display

(P)

mode

EBCDIC

A P will

to

is

used

operator

mode

then

indicate

to

transmit

bit

combinations

can

place

by pressing

be displayed

the

transmit-

over

the as

the

FUNCT

on

This

mode

with

the mode. mission;

of

operation

exception

PI

indicates an

PT

indicates a

is

identical

that

data incompleted completed

to

is

transmitted

transparent

the

transmit

in

transparent

trans-

transmission.

mode

Disk

Data

Set

Normal Data

HasHDR1

•

tions 1 through

Has valid

•

and

Is

•

I s

•

Is

•

data

position 41 )

. Bypassed Data

Has HDR1 in posi-

•

tions 1 through

I s accessible

•

Has valid

•

and record length Is

•

Has a B (bypass)

•

in

Deleted Data

I nvalid Data

Does

•

in

4

Has invalid

•

record length* Is

•

Is

•

extents

record length accessible not

deleted

not

a bypassed

set

(B

extents

not

deleted

position 41

Set

not

have H DR 1

positions 1

not

accessible

deleted

Label

Set

Label:

inposi-

in

Set

Label

Label:

through

extents

4

Label:

4

or

Transmit

Data

transmitted.

Data not transmitted

Mode Receive Mode

set

wi

II

be Label will be

set

will Label will be

be used

set

will Label wi

be be used

used

in

ceiving

in

receiving

data

re-

data

II

in

not

Transmit/Receive

On Disk 1 On Disk 2

Transmitting

set

Data

be trans-

mitted

Data

set

not

be

transmitted

Data

set

not

be

transmitted

Receiving

will Not used

because label identifies 1.

data

set

that

was

transm

itted

will Labels be- Data set will

yond

the last transmitted

data

set

will be

in

used receiving

data

will Label will

not

be used

in

receiving

data

Mode

Transmitting Data

be trans- be used in

mitted

itisthe first set

2. it

is tinuation of last set mitted disk 1 .

not

be be used

transm

Data not

be

transmitted

Receiving

set

if: receiving

data

(00008)

a con-

the

data

trans-

itted

set

Label will

will

data

on

Label will

receiving

data

will Label will

not

used in

receiving data

in

be

*The

extents

Note:

Subsequent written the

write

protect

Figure 34. Effect

70

The

over

protect

byte

and

write

data

during

can

of

record

protect

set

labels

receive

byte

status

be used.

Labels

lengths

byte

are

not

operations.

of

Contact

on

BSCA Modes

are

not

of a data

checked.

On

the

first used label was

your I BM

checked

set

label

Therefore,

early

representative

after

the

is

checked

caution

shipments

not

first received

only

for

should

of

the

3741

used.

Your

for

more

information.

data

set.

the

first

data

set

be used

3741 can be field

with

to

ensure

binary

synchronous

to

be received

write

upgraded

on

either

protected

communications,

so

that

data

the

disk.

is

not

write

Transmit

Figure 35

that

is

to

be

transmitted,

selects

the

Mode

Examples

shows

the

be

transmitted.

transmit

layout

the

mode.

of

To

operator

a disk

cause

inserts

with

the

data

the

a single

on

this

diskette

data

disk

and

set

Figure

36

mitted. not this and selects

Data

transmitted

disk

to

shows

set

in

be

transmitted,

the

transmit

the

layout

labels

transmit

of

a disk

with

a B (bypass) in

mode.

the

operator

mode.

To

that

cause

is

to

position

the

inserts

be

data

the

trans·

41 are

on

diskette

19

Data

Track

Figure

Set

00,

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Label Address

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Status

Beginning End

of

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of

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35.

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set

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the

label

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contains

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Figure

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of

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Communications

71

Receive

The location the disks, an

pressing

then

indicate

The

Mode

receive

second

and

mode

store

disk

operator

FUNCT

be displayed

the

receive

3741

can

(R)/Expanded

then

through a modem

the

remote

Oata

transparent

received in

Note:

pactly

the

labels associated cation fied in of

the status labels. data the

write

received

when

are used

records

When

on

the

occurs

any

extents

of

the

This

that

has

protected

data.

using

for

location

received

mode;

the

transparent

data

diskette.

independent

of

the

also

second

means

write

Therefore,

diskettes

receiving

is

used

to

receive

that

data

on

feature

can place

SEL

upper,

on

the

is

installed).

the

COMM, and R.

status

mode.

be

connected

and

subsequently

and

store

with

an

records received

mode.

sets are received,

The

3741

with

the

of

labels

on

the

occurs

independent

and

any

succeeding receive

that

if a

diskette

protected

data

may

you

with

write

data.

Communications

data

from a remote

one

disk

or

two

After

loading

3741

in

receive

line

of

the

CRT

to

the

telephone

receive

data

it

on

the

disk(s).

STX

are

received in

with

a OLE

data

is

written

modifies received the

extents

diskette.

data

sets, it

be

written

should

protected

the

data.

previously identi-

The

of

the

is

used

for

is

possible

over

exercise

data

Receive

disks (if

the

mode

by

An

R will

display

line

from

the

non-

STX

are

com-

extents

This modifi-

modification

write

protect

data

set

receiving

that

with

the

caution

sets

that

in

to

If

the

1.

2.

same

each

communication,

data

set

receive

data

If a variable

data

set

BOE

in

cation

you

data

because

modified

3.

Another number ber

of

data

transmit

In

this

manner,

each

day

exact

number

always receive

The

labels

for

HOR

1

(or

bypassed) labels

BSCA

feature

Record Length:

length

of

the

first record received

was

positioned selected on a record mined

communications

within

by

the

label.

number

labels as required

into

number

to

null

each

can

if

data

technique

of

data

of

data

set

the

same

of

data

(empty)

data

tell

the

was

set

label.

which

extents

written

that

by

can

sets are received

sets are received, during

up

the

for

the

data

sets

making EOO equal

Then

data

sets

in

the

into

be

sets fixed by having

a null

data

set

for

each

the

remains

the

data

will

modify

The

on

the

number

constant

of

data

into

set

record length

data

mode.

data

of

and

set

labels

the

same

to

be

received

and

must

the

following fields

is

in

the

set

label

when

If

the

set,

the

record

record length specified in

exact

number

job

and

then

sets.

are

received,

after

each

communi-

have received new

data

set

label are

the

data

set.

used

when

a variable

is

to

keep

the

processing

daily inactive file.

data

sets received

you

can

set

up

required

not

determined

and

data

sets.

must

be valid

be

deleted.

of

data

set

the

operator

disk was

length

the

corresponding

then

the

from

if

the

positioned

is

of always

set

each

to

num-

unit

the

The

label:

the

disk

deter-

Because written the

following

of

write

72

of

the

over

in

techniques

protected

possibility

receive

data

of

modes,

be used

being

write

it

is

to

written

protected

suggested

minimize

over.

data

that

the

BOE

First received

data

set

on

BOE

first disk

data

sets

disk

data

set

on

Previous EOO

01001

Succeeding first

or

second

First received

on

second

Figure 37. Generated Extents while in Receive Mode

disk

sets being

one

of

possibility

of

the

label

Beginning

not

is

made data 37

changed

equal

set

for

summary

of

Extent:

on

the

label

to

the

end

all succeeding

of

extents

The

operation.)

EOD EOE

BO

E +

number

of

records received

BOE

+

number

of

records received

BOE

+

number

of

records received

beginning

of

the

of

data

generated

of

extent

first

data

set

(EOO)

of

the

sets received. (See Figure

during

EOO - 1 (if null

EOO)

set,

EOO - 1 (if null set,

EOO)

EOO - 1 (if null

EOO)

set,

(BOE)

received

pre~ious

receive

mode

data

is

and

End

of

Extent:

equal

to

the

End

of

Data:

end

of

extent

In

this case,

equal

to

the

Multivolume Indicator:

first disk overflow The

multivolume indicator

to

an L

to

All

other

If

the

operator from any position position key

the

entry

recording

If

one

or

RC

is

displayed

completed

If a disk

error

displayed on

automatically answer a indicates

and

mount

correct

or

The

record address

The

end

plus 1,

the

end

beginning

is

changed

of

the

first disk

indicate

label

the

information

desires

on

disk

to operations, data

from

two

disks

of

on

the

reception

occurs

the

display's

RC

or

RJ.

new diskettes.

bypass

the

end

of

extent

(EOE) address

of

the

last recorded record.

of

data

(EOO)

is

made equal

except

of

to

any

that

of

or

For

when a null data

data

and end

of

extent

The

a C

(continued

is

written

of

last disk

is

to

start

the

first disk,

record

and

subsequently

multivolume

of

extent

address.

data set) when

on

the

second disk

of a continued

left unchanged.

recording received

the

operator

of

any

data

start

disk position.

data

are received with no errors, an

display's

status

line

data.

if

the

disk(s)

is

full,

status

line.

The

telephone

RC,

error

call if

the

operator

For

RJ,

the

condition

the

operator

in

order

set

indicator

second disk.

set

receiving

to

indicate a

then

3741 will

mode

can

receiving data.

If

the

mode indicator remains R (as it would in a line check, remote answer a at shipments was selected with a must Your not tion. tion. If are performing that is

abort,

telephone

the

same place as

reposition

3741 can

have

to

Contact

your

the

communications

displayed.

or

a length

of

the

3741 Model 2, if

the

be

field upgraded so

reposition

your I BM

3741 has

unattended

check

occurred),

call

and

will receive

the

original call. However,

the

data

communications

data

set

record displayed,

disk

to

the

original starting position.

that

the

disk

to

the

original starting posi-

representative for more informa-

not

been field upgraded

operations,

mode

it

is

recommended

be selected while

the

operator

is

made

to

is

received.

are made

of

is

changed

data

set.

data

can

with

normal

RJ will be

not

indicator

check

must

to

continue

3741

will

beginning

on

early

mode

operator

and

you

the

and

status

does

label

Notes:

1.

SOH, STX, (when parent will be deleted

not

prohibit

in

text

be

in

2.

The the

non-transparent mode:

ENO, OLE, NAK, ITB,

or

OLE STX

not

immediately preceded by a OLE) in trans-

text

will be recognized

from

the

transmission

even

though

the

such

in

non-transparent

as

control

text.

Other

of

these

characters

BSC

are

text.

following characters

cannot

and

SOH,

I RS

be

received as

STX,

(only

control

for

communications) .

With

the

expanded

the

3741 has

transmission blocks

I

RS

characters. Each record acters if more be received. Records can be

communications

the

capability

containing

than

one

feature

of

receiving

up

must

non-transparent

to

512

bytes

be

separated

record per transmission block

spanned

between mission blocks. Transmission block lengths than

the

length

of

each record, mission block block

in be received with When

the length, no I or

ETB (OLE ETB

first transmission block

records ETX or ETB

transmission blocks

For

the

of

the

data

either

transparent

the

expanded

transmission block length equals

RS

character

or

OLE ETX in

determines

in

that

data

set. An I RS

character

is

except

receive

portion, received. Each record within must

be

the

same length. Records

I

RS

characters if more

block

is

to

be received. Records can be spanned between

two

transmission blocks. Transmission block lengths

be greater

than

the last transmission block

The

receive

operation

mission block in

When

the

transmission block length equals

no I RS

The

parent mines prior blocks

character

first IRS, ETX,

text)

character

the

record length

to

ETX

or

except

the

than

length

of

can also receive

either

transparent

is

required.

or

ETB (OLE ETB

of

ETB

is

mandatory

last block.

except

for

set. One record per transmission

or

non-transparent

communications

is

required.

The

first IRS, ETX,

transparent

the

record length for

character

mandatory

the

up

to

one

of

each record,

the

on

all multiple record

last block.

512

bytes

per block can be

the

data

set

must

be separated by

record per transmission

data

set.

one

or

non-transparent

or

the

first transmission

for

records in

that

for

all multiple record

or

OLE

STX

characters

products

and

may

characters

not

supposed

data

to

in

ETX, ETB, EOT,

expanded

in

receive mode,

of

data

and

by I RS char-

is

to

two

trans-

must

be greater

the

last trans-

text

can also

feature.

the

record

text)

of

the

preceding

the

being received

must

except

for

the

record

per

trans-

text.

the

record length,

OLE ETX in trans-

block

deter-

data

set. IRS

Communications

73

Receive Mode Example

Figure

38

illustrates an example example, one data set receiving data, receive mode. The 3741

will

the

operator inserts

of

receive mode.

be received. To prepare for

the

diskette and selects

is

then ready

to

receive data.

In

this

Transmit/Receive Mode

The transmit/receive mode of operation data and receive data

loading transmit/receive mode by pressing FUNCT SEL upper, COMM, status line to indicate

the

and

disk(s),

B.

A B

(B)

without

an

operator can place

will

the

operator intervention. After

then be displayed on

transmit/receive mode.

is

used

the

to

3741

the

transmit

in

display's

a

Disk Capacity

1898 Records

19 Data Set Labels

Track 00, Sectors

Label Add ress 00008

Label Status

Beginning End

of

Data (EOD) 01001

End

of

Extent (EOE) 73026

*These extents

will depend on the amount

08-26--",~~~

of

Extent

will

be

~~~~c~~;~:~~

I~

l~

w

~

HDR

(BOE)

01001

modified

of

data received for the data set).

-------BEFORE

I

~""~---...:....

r

__

\'Y\I

to

--------------EOE------------------------

~~~~

1

appropriate addresses by the communications program (the addresses generated

RECEIVING

DATA------

__

1

----'

UJ

~

extent

o

'I

HDRl

50024** 50023**

addresses.

------AFTER

~

19 Data Set Labels

Track 00, Sectors 08-26

Label Address 00008 Label Status

of

Beginning

End

of

End of Extent (EOE)

**Note

Figure 38. Receive Mode Example

74

Extent (BOE) 01001

Data (EOD)

the

modified

.~

E.OE.

RECEIVING

<;;,.O\)

-'"

DATA-----

The

3741

can

then

through a modem. data

will

be

transmitted

all

index

positions possible can B (bypass) in labels C in the

indicated

status

transmission.

be

transmitted.

position

that

are

deleted

the

multivolume

continuation

in

the

line

indicating a completed

transmit/receive

received receiving

data and label qualifies or

For

of extent address

To

last

The BOE 01001

into

the

data.

if

it

is

a valid HO R 1 label, has a B in

is

after

the

a HOR1 label

the

first

data

the

data

set's

of

the

last

is

equal

transmit

data

disk 1

set

transmitted

of

the

if

transmission

For

last

for

to

first

be

connected

When

the

to

connection

beginning

of

disk

one

have

Only

valid (HOR 1)

Valid (HOR 1)

41

are

not

transmitted.

or

invalid

are

of

the

mode

indicator

data

indicator

will allow

set

on position

transmission.

mode

then

switches

first

data

set

whose

disk 1, a label qualifies

transmitted

receiving

with

set

to

label

is

data

a B in

be set

set

data

if

the

bypass field.

received,

to

one

transmitted

73026.

and

receive

on

disk

on

disk 1

data

set

label

ends

on

disk 1.

the

telephone

has

been

with

the

first

been

interrogated

data

set labels

not

transmitted.

transmitting

disk

two.

A BT

on

the

to

receive.

label qualifies

for

the

bypass field,

set.

For

disk 2, a

it

is

a valid HOR1 label

the

beginning

more

than

the

unless

the

2,

set

EOE

to

73026.

on

disk 2

is

line

made!

disk

until

set

labels

with

Data

set

is

display's

The

Data

for

receiving

of

extent

end

of

last EOE

of

the

set

to

for

a

A

is

When

the

3741

it, it will

and

If a disk the a B I in

display

reception

error

transmission

the

mode

line. If a disk the

receive dicated status

pass

If

remote

the

line.

the

mode

in

the

error

abort, will answer a at

the

same place as

shipments

of was selected must

reposition

Your

3741

not

have

to

tion.

Contact

tion.

If

your

are

performing

that

the

communications

is

displayed. If if a line curred),

ceive

the

check,

the

data

has received all

BC

to

indicate a completed

of

data.

or a transparency

portion

error

portion

mode

The

operator

indicator

of

or

a disk full

of

this

indicator

position

mode

must

condition.

indicator

or

phone

the

with a data

can

reposition

your

3741

message

call the

3741

the

disk

be field

IBM

has

remains B (as

aborted

and

original call.

Model 2, if

set

to

upgraded

the

disk

representative

not

unattended

mode

the

mode

indicator

remote

abort,

3741 will answer a

beginning

at

the

of

the

error

this

mode,

of

condition

of

operation,

position

intervene

it

error

will

transmit

communications

record

displayed,

the

original

so

that

to

the

been field operations,

be

selected

remains

or

wrong

telephone

receive

data

transmitted

transmission

has

occurred

the

3741

the

display's

occurs

of

the

to

correct

would

if a line

occurred),

the

However,

starting

the

operator

original

for

more

upgraded

it

is

recommended while

BT (as

length

call

mode

start

during

will

status

during

a BJ

is

display's

or

the

data

beginning

on

early

mode

the

operator

position.

starting

informa-

and

you

the

it

check

oc-

and

will re-

point.

to

indicate

in-

by-

check,

3741

does posi-

label

would

Data

can

be

received

or

subsequent

of

extents

generated

transmit/receive

Succeeding first

or

second

First

data

set transmitted first

or

second

First

received second ended

Figure

disk

on

disk

39.

Generated Extents while in Receive Portion

and

telephone

during

recorded

call. (See Figure

the

on

receive

the

disks

portion

in

the

39

for a summary

of

the

same

mode.)

BOE EOO

data

sets

disk

on

Previous EOO

BOE records received

following a Previous EOE + 1 BOE +

data

set

on

records received

disk.

data

set

if

the

1.

on

transmit

01001

BOE +

records

of

the

Transmit/Receive Mode

The

receiving telephone same tion

with

+

number

received

call.

telephone

a CPU.

of

data

can

The

receiving

call

only

EOE

EOO - 1 (if null

EOO)

set,

EOO - 1 (if null set,

EOO)

EOO - 1 (if null

EOO)

set,

occur

when

of

on

data

the

3741

data

same

can

or

take

is

in

communica-

subsequent

place

on

the

Communications

75

In

the

expanded

of

the

transmit/receive mode,

of

receiving

up

to

512

within

each characters if more is

to

be received. Records can be spanned between

communications

the

non-transparent

data

bytes. Each record must be

data

set. Records

than

transmission blocks

must

one

record per transmission block

feature receive 3741 has

the

be separated by IRS

transmission blocks. Transmission block lengths greater transmission block mission block can also be received with feature. When

record length, no I IRS, ETX

text)

length ceding multiple record transmission blocks

The

mode

that

block. Each transmission block can contain

bytes

transmit/receive mode status

each record

record separator)

record. Records are read

buffer

between

The

be

other

parency

transmitted

The

separate block

format

than

the

length

of

each record,

of

the

data

set. One record per trans-

in

either

transparent

the

transmission block length equals RS

character

or

ETB (OLE ETX

of

the

first transmission block determines

for

the

records

ETX

or

in

ETB

that

data

character

or

non-transparent

expanded

is

required.

or

OLE ETB

set. An I RS

is

mandatory

except

Expanded

be

contained

Communications

expanded

(K)

communications

is

similar

to

multiple records are

of

data. When

line.

For

in

the

transmit

buffer

character

until a

complete

in

the

buffer. Thus, records are

Transmit/Receive Mode (K)

feature transmit/receive

the

transmit/receive

transmitted

expanded

is

selected, a K

portion,

is

followed by an IRS (inter-

in

communications

is

the

which defines

from

disk into

record

and I RS

transmission blocks.

I RS and I FS (interfield separator) characters

sent

as

data

in

the K mode

data

link

control

error

will result.

in

T,

B,

P,

or

operator

identification

without

of

this block

TeAM

Programmer's Guide, GC21-5071.

is

described in

of

operation. If these

characters

are read from disk a trans-

The I RS

0 mode.

card

data

a following I

or

the

I FS

is

RS

except

for

communications

The

in

transparent

character

the

mode

each transmission

up

displayed in

last

character

the

end

the

512-byte

character

not

character

transmitted character.

IBM 3740

portion

capability

containing

same length

two

must

be

the

last

text

the

first

the

record

pre-

on

all

last block.

(B)

except

to

512

feature

the

of

that

cannot

spanned

cannot

or

any

can be

as a

The

BTAM/

Transmit-Transparent/Receive Mode (D)

The

transmit-transparent/receive

used

to

transmit

data

without

After

loading

in

a transmit-transparent/receive

SEL

upper,

the

display's

data

in

operator

the

disk(s), an

COMM, and

status

line

the

intervention.

O.

to

mode

transparent

operator

mode

A 0 will

indicate

can place

then

the

receive mode.

This

mode

of

mode

with

the

transparent

mode. OT, 01,

corresponding

operation

exception

to

is

that

BT, BI, BJ

identical

OJ,

to

the

data

is

transmitted

and DC have meanings

and

BC

in

mode.

Writing

It mode data over

lowing keep

Since

start the write data transmitting with where

of

Received Data Over Previously Transmitted Data

is

possible

the

on

to

transmit

the

same space

technique,

data

the

technique

the

that

data,

be

was

writing received

EOE

of

the

last

received

data

was previously

as

the

BOE, EOO,

you

want

the

On a 3741 Model 2 procedure can and

then

on

disk 2. Disk 1 can

be

receive

used

1897

ceived records are if EOE

ing

at

01002.

is

01001,

received records are

3741 Model 2

and

then

on

the

sure

that

there

transmitted

used

for

transmit/receive

data

in

the

data

set

transmitted,

over a

portion

transmitted.

last

data

set a null (empty)

and

EOE

set

received

or

written

4 with

to

transmit

records

contain

to

data

two

on

only

disk starting

or 4 in

receive

disk. Before using

is

no

to

another

of

the

This can be

to

the

to

be

disk drives,

one

disk 1

1897

written

of

operation

mode

is

and receive

the

3741

by pressing FUNCT

be displayed

on

transmit-transparent/

transmit/receive

in

the

transmit/receive

data

and

write

the

fol-

requirement

to

location.

mode

is

to

sector

past

it

is

possible

to

disk from which

done

by

data

set

desired address

written

full disk

and

on

the

of

1898

the

disk.

preceding

data records

records since re-

at

EOE+1.

to

Thus

disk start-

76

Transmit/Receive Mode Examples

40

shows

the

Figure set identified by receiving received EOE + 1 address

of

data

one

transmitting

the

data

set on

will be placed

for

the

data

This

data

set

tra'nsmitted.

Disk Capacity 1898

Records

set

label the into

set

is

_"'-'l'"T"r""'I

same

the

of

one

at

00008) diskette.

data

defined

o

U.1

data

set

by

UJ

set

(the

and

then

(The

starting

the

data

the

at set

label

at

00008.)

diskette

mode.

Note:

ing in

When

data

the

and

selects

To

receive

the

last

transmitted

position 41

the

will be received starting

transmit/receive

data

I n this

example,

the

transmit/receive

data

on

data

order

to

set.

the

disk 1,

the

set

must

receive

data.

mode

switches

at

EOE + 1 address

operator

data

have a B (bypass)

inserts

communications

set

label follow-

to

receive,

of

the

19 Data

Track

19 Data

Track

Set

00,

Label Address

Status

Label

Beginning

End

of

Data (EOD)

End

of

Extent

*These

extents

will

depend

Set

00,

Labels

Sectors

08-26

of

Extent

(EOE)

will

on

the

Disk Capacity

1898

Records

Labels , \

08-26

~~g§

co

~

00008

HDR1 HDR1

(BOE) 01001 03001 *

01020

01026

be

modified

amount

of

-----BEFORE

w

§UlUl

o

UJ

co~cP

~

\/

~§g

to

appropriate

data

received).

00

'§~~g

00009

with

bypass

03001 *

16026*

addresses by

RECEIVING

the

communications

DATA-----

---------~§§

program

(the

addresses

generated

Label Address

Label

Status

Beginning

End

**Note

Figure 40. Transmit/Receive Mode Example

of

Data (EOD)

of

Extent

the

Extent

(EOE)

modified

(BOE)

extent

00008 00009

HDR1 HDR1

01001 01020

01026

addresses.

-----AFTER

with

bypass

02001 **

·17001 **

16026**

RECEIVING

DATA-----

Communications 77

Figure

41

illustrates

drive 3741 Model 2

In

this example,

mitted

to

the data sets are labels

to

be

to

00011 and

used for receiving these data sets. '

the

status of a disk

or

4 before teleprocessing

two

key-entry data sets are

remote processing unit and

be

received from

00012

have been set up (via bypass status)

the

on

a single disk

is

initiated.

to

be trans-

two

additional

processing unit. Disk

Disk Capacity 1898 Records

19 Labels, Track

Sectors 08 ...... 26

00

_------Key

~

~~~~~~~~~~~~~~------------------------------------~

w

o

co

w

o

co

w

o

co

Entry Programs (will not be transmitted)

Key

Entry

Job

# 1 } These two data sets

Key

En~ry

Job

#2

will be transmitted.

Label Address

Label Status

00008 HDR1

with bypass

of

Beginning End

of

End

of

Figure 41. BSe Transmit/Receive Example (Before Teleprocessing Initiated)

78

Extent (BOE) 01001 Data (EOD) 01020 Extent (EOE)

01026

00009

HDR1

03001

14017 16026

00010

HDR1

18001

30008

32026

Figure 42 illustrates the receive mode teleprocessing function that key entry the disk

-programs

without

stat.us

of

the disk after the transmit/

(for

example) may

being affected by teleprocessing.

was

completed. Note

be

stored on

Disk Capacity 1898 Records

19

Labels, Track 00

Sectors

08~

26

w

0

co

_-----Key

___

Key Entry Job # 1 Key Entry Job

~

o w

o 0

w

co

Entry Programs

#2

.

w

o

w

W

o(S

Q

0

w

~

w

0

j

w

0

co

.

These

two

0

IJ.J

o(J

C

0

IJ.J

I

IJ.J

data

sets

Label Address Label Status

Beginning

End

Figure 42. esc Transmit/Receive Example (After Teleprocessing Completed)

of

Extent (BOE)

of

Data (EOO)

of

Extent (EOE)

00008 HDR1

with bypass

01001 01020 01026

00009 00010

HDR1 HDR1

03001 18001

14017 30008 16026

32026

00011

HOR1

with

bypass

33001 46013 46012

00012 HDR1

with bypass

46013 63025 63024

Communications

79

Inquiry

Mode (I)

Inquiry on valid must indicator tification "IB"

The

inquiry up

from

message.

date or

ify

All

mode

a valid

data

be 128.

on card

if

the

display

mode,

to

128

read index

If

mode,

record advance

that

message

data

shown

transmitted

FUNCT

SEL read index address update address

of

mode,

of

can be selected

data

set

label

set

record.

After

inquiry

the

display shows an

reader

is

operator

portion

the

of

operator

identification

characters. If

mode,

the

operator

the

operator

to

a previous

to

create a new

on

the

to

the

processing

upper

and

mode,

the

data

set. If

the

inquiry

the

data

set.

from

read index

or

from

update

mode

The

record length

mode

not

installed. The display showns

the

display

is

selected,

"I"

if

card

is

blank.

for

the

operator

reader

After

can key an inquiry record

the

operator

the

operator

selected inquiry

may choose

selected inquiry

keys

to

record backspace

inquiry

message

the mode

inquiry message.

display

inquiry

(up

to

unit

when

S. If inquiry

record

inquiry

message

mode

is

the

last non-blank)

the

mode

as selected

is

written

was selected

written

mode

when

data

the

mode

is

installed.

selecting

entire

from

and

operator

at

the

at

the

when

on

a

set

iden-

of

mode

inquiry

up-

mod-

pressed

from

BOE

from

EOD

is

Responses at

the After is

displayed vance set. All records

disk

to

the

inquiry

address following

all

responses are received,

to

the

or

record backspace

(both

with

a record length

blanks, if necessary.

After

receiving

tor

can

then

inquiry message following upper

and I will blank

The

EOD address

the

inquiry message (lC

the

send

would

the

last received response record. FUNCT

EOD-1.

Notes:

1. If an

2.

error

message,

check

and data

occur.

If

an

error

always

check

occurs while

the

EOD

occurs while receiving responses,

updated,

(W)

errors

record are

the

operator.

inquiry

of

responses

another

be

the

is

updated

mode).

is

not

set

not

except

occur.

written

transmitted

the

first response received

The

operator

to

display

and

response) are

128,

and

to

an inquiry record,

inquiry record if required.

written

to

on

disk

inquiry message.

may record

any

record in

written

are

padded

disk

at

the

disk address

starting

the

with

the

ad-. data

on

opera-

The

SEL

display screen.

after

receiving all responses

The

EOE

trying

to

transmit

updated,

except

is

updated

an inquiry

when line

to

ready (errors C and I respectively)

the

EOD

is

when

disk errors

or

wrong

length

80

Binary Synchronous Communications Summary

Figure 43 summarizes the functional capabilities of binary synchronous communications for the 3741 Models 2 and 4.

Function

Transmit:

Non-transparent Data N/A Transparent Data N/A

Record Length N/A

Block Length N/A

Records Per Block

.. Selected Records N/A Selected Fields N/A

From Two

Disks

Multiple Data Sets N/A

Receive:

Non-transparent Data Transparent Data Record Length

Block Length Excluding

I

RS

Characters

Records Per Block Selected Fields On

Two

Disks

Multiple Data Sets

R

N/A

Yes Yes

~128

~512**

~1

Yes Yes Yes

T

Yes No

~128

P B D

No Yes

~128

1 1 No No Yes Yes

No

No No Yes Yes

N/A N/A N/A

N/A

N/A N/A

N/A N/A N/A N/A

N/A

N/A N/A

Mode

J

Yes

No

~128

1 1

No

Yes

No Yes

~128

No No Yes

Yes

No

~128

~512** ~512**

>1

Yes Yes Yes

Yes Yes

~128

~512** ~512**

~1

Yes Yes Yes

Yes Yes

~128

~1

Yes Yes Yes

N/A N/A N/A

N/A N/A N/A N/A N/A

K I

Yes Yes

No

~128

>1

Yes Yes Yes Yes

Yes Yes

~128

~512

~1

Yes Yes Yes

No

=128*

~128

1 No No No No

Yes Yes =128*

~512

~1

N/A N/A N/A

I

Print After Receive:

No

Format Control

Data

Steam Format Manual Format Select Record Format

N/A

= Not applicable

* Records written

Select

to

blanks.)

**Systems without the

Figure 43.

Binary

Synchronous

Yes

Yes Yes

N/A N/A N/A N/A N/A N/A N/A

disk are always 128 characters.

EBSCA

feature can only transmit and receive block lengths up

Communications

Summary

Yes Yes

N/A

Yes Yes

(If

less

than 128 characters are received, the record

Yes Yes Yes Yes

to

N/A N/A N/A N/A

128 characters.

Yes Yes Yes Yes

is

padded with

N/A N/A

Communications

81

OPERATING PROCEDURES

Figure

44

provides a general

for

communications vides a general mode.

except

operator

procedure

i

Automatically

operator

for

procedure

inquiry. Figure

overview

Turn

Format

to

be selected?

overview

45

pro-

for

inquiry

Start

Load programs required. Programs are used unattended, records, fields

operations.

used buffers are cleared

grams.

Position

Keylock

into

buffers 8, 9,

--

transmit

and

receive

and

Also, ensure

first

I

•

data

•

feature

,

Load Diskette(s)

to

selected fields or

set

i

YES

I

key lock

,

on

I

Print

unattended

,

to

i

YES

•

control

program

,

i

Manually

I

Select program level

to

be

Figure

46

illustrates

CRT

display

and

with

print

insert selected

that

of

control

label

installed?

be selected?

used

status

A if

un-

pro-

the

status

line during BSCA

i

NO

I

i

NO

indicators displayed

operation.

on

the

YES

Is

remote

i

YES

Key in

remote

•

I D

character

Figure

44

(Part 1

of

5). General

82

Operator

I D being used?

Procedure Overview

I

,

Remote

Press

I D

FU NCT

Feature

•

i

NO

I

Insure cursor in

position

one

Opper

installed?

i

NO

the is

and COMM

Print unattended

,

YES

Turn on AUTO R

Press FUNCT SEL upper, PRINT

TO

EOD I

For 3715 and 3717, set AUTO

P

or

to

OUP/SKI OFF for single spacing.

For 3717, set PROG

to

ALL CHARS if you do not want

unprintable character error

the

posted, you want the unprintable character error posted.

I

EC

AOV

switch

I

on for double spacing,

I

NUM

SHIFT

NUMBERS ONLY

if

Switched or nonswitched?

I I

Switched Nonswitched

•

to

be

selected?

•

,

I

NO

I

Unattended ACL program execution (Model 4 only)

to

be selected?

,

i

YES

I

Press

E

i

NO

Figure

44

(Part 2

NO

Operator

10

I

feature Installed?

I

NO

Procedure complete

of

5). General Operator Procedure Overview

I

6

Was

,

I

Operator 10 featu

Press

Procedure complete

selecttde

(T,

P,

B,

D,

J,

K) I

R mode selected?

,

i

YES

I

re

•

NO

I

REC

AOV

I

R

. Procedure complete

to

be used?

,

YES

I

•

YES

I

Insert Card

Procedure complete

I

Communications

83

riB

M 3872 or

IBM

,

If

dialing, press M (wait for C mode before pressing the M key)

1200

bps'

ntegrated

MOdem?,

NO

..

________

Operator

i

NO

Select mode (see Note

(T,

Was

,

NO

I

ID

feature installed?

,

Operator I D feature

I

NO

I •

NO

I

P,

B,

D,

R,

J,

K)

I

R mode selected?

,

i

YES

I

YES

Manual answer?

1)

to

I

,

________

be

used?

YES

Answer

and raise exclusion key

pIne

.'

,

YES

•

when it rings

Note

ready.

Figure

84

1:

44

If

WT

(Part 3

PSN

of

5).

Press R EC

1200

bps Integrated Modem, except for Auto Answer, do

General

Operator

Procedure

I

ADV

Overview

I

I nsert card

not

select mode until the remote terminal

is

IBM

Auto answer?

,

NO

3872 or

i

NO

IBM

I

,

Push button on modem

,

1200 bps Integrated Modem?

,

IBM

I

YES

I

auto answer

IBi72

I

YES

3872 or

IBM

i I

I

1200 bps integrated modem?

,

IBM

1200 bps integrated

modem

Manual answer or dial?

I

Dial

r-'

Push talk button on modem,

then dial

I

When

remote

is

ready,

answer tone

will

be

on.

I

Push data button on modem

I

Procedure

complete

I

Manual answer

I

Push button on modem and wait for

calli

Answer phone when it rings

I

When is

ready, push data button on modem

I

Procedure complete

I

talk

remote

I

Procedure

complete

Dial

Raise

exclusion

key,then

dial

When

is answer tone is

Hang

set (See Note

Procedure

complete

I

remote

ready, on.

I

up hand

I

2)

Dial

or

answer?

I

:

Answer

I

Manual answer or auto answer?

I

Manual

I

Hang up hand

(See Note 2)

set

I

Procedure complete

,

I

Auto

I

Procedure

complete

Note

2:

Do

not

hang up until status

Figure

44

(Part 4

of

5). General Operator Procedure Overview

is

displayed on line 6

of

the CRT display (see Figure 47).

Communications

85

Dial

,

or Answer

,

Figure

Set TALK DATA switch to TALK,

then

when remote raise data key and set TALK DATA

switch

Do

not hang up

hand set

Procedure

complete

44.

(Part 5

of

i

Dial

I

dial.

I

to

I

5)

is

DATA

General

ready,

Operator

Manual Answer or Auto Answer

I

Manual

I

Set TALK DATA switch wait for

I

Answer phone when

it rings.

raise data key and TALK DATA switch to

DATA

I

Do

not

hand set

I

Procedure complete

Procedure Overview

Answer

to

TALK,

call

When

hang up

i

I

and

ready,

I

AUTO

Note: TALK

switch must to

DATA

I

Procedure complete

DATA

be

set

86

Start

I

Load diskette(s)

Position on data set label or

search

length for

I

to

data record. (Record

datIet

must

be

128.1

Turn keylock on

if

I

Press FUNCT SEL upper and

I

Press I key

Operator I D feature installed?

i

No

..

----------

Is

a previous record

y

in.uir

NO

I

,

Press R

message?

EC

..

installed

COMM

I

YES

Operator I D feature

,

NO

I

,

to

be used?

I

ADV

----------------.

to

be used or modified for this

I

YES

i

YES

I

Iniert card

Figure 45. Inquiry Operator Procedure Overview

o~eratar

message (FUNCT SEL

upper and

previous data being message if

dij'ayedl

Press

inquiry

Wait for response. When

received,

and

Another inquiry message

keys inquiry Operator

BKSP

I blanks any modifies record

FUNCT SEL upper and S

message.1

IC

the

first record received

I

is

displayed on status line

•

all

records are

is

displayed .

to

be sent?

to

send

p!sses

to

get

requir~d.

I

,

•

YES

I

Press FUNCT SEL lower and

RETURN Inquiry mode

Procedure complete

NO

I

TO

I

REC

ADV

to

desired record and

to

form new inquiry

INDEX.

is

terminated.

or

REC

Communications 87

BSCA

Modes

Pos.

37 38

Status Indicators

Pos.39

Communications Transmit Transmit·Transparent

Receive Transmit/Receive Transmit-Transparent/Receive

Expanded Communications Transmit

Expanded Communications Transmit/Receive

Inquiry

Print

Unattended---

Mode-------~--------~

Transmission Transmission Incomplete

Reception Complete Reception

Card Reader

Note: During

the Customer Engineer during trouble calls. See

BSC

Complete-------------I

Incomplete---------

ID

Decision Required

operations, line 6 of the CRT displays diagnostic information

____

_______________

________________

C T P

R

P

B

P

D

P

J

P

K

I

-'

I

_________

_______________

BSe

eE

Status Line for more information.

---------------

T

C

T

C

~

--I

that

--'

J

..--I

is

used by

B B

B

88

Figure

I

f

DTR

Figure 47.

46.

I I

f

DSR

Status

4

BSC

Indicators on

7

f

RTS

CE

Status

Line

of

CRT Display during BSCA Operations

24

I I

'-v-"

I

t

2-second

t.meout

count count

29

T

3-second

timeout

5

1

~

I

~

NAK

Count

19

I

t

10

I

I I

f

CTS

Line

14

I I

~

CRC

Count

I

t

LINE TERMINATION AND

The

following sections describe line

error

that

conditions

can

BSCA errors disk address and processing

Procedures,

restart

error

provides

the

communications

occur

and indicators,

during teleprocessing, and

the

record displayed mean

occurs.

The

information

teleprocessing.

Termination

On

switched lines: a

nect

sequence

or

when

out

of a communications

data

and

under

• if a

1.

of

is

RESET

end

of

the

following

disconnect

The

mode

the

Data Call

data

call

received,

is

pressed. Pressing RESET

mode

extent

are

conditions:

sequence

is

R,

RC, BT, BC, OT,

ERROR

CONDITIONS

termination

and

section,

mode when

is

Error

on

how

an

terminated

the

when a disconnect

of

operation.

updated

is

(see Figure

received

and

either:

~C,

of

a call,

BSCA disk

what

when

a tele-

Recovery

operator

error

stops

when

a discon-

timeout

takes

the

The

end

37

or

KC,

or

the

can

the

occurs,

3741

of

39)

KT.

Transparency Check (T)

This

error

(J, T)

or

following

condition

a transmit/receive, (B,

characters

occurs when

is

read

from

K)

NAK, ENQ, ETB, ETX, ITB, STX, sends ENQ and

also occurs

is

in from control

then

follows

the J or

disk.

character,

in

place

of

the

data

the

response with an EOT. This

when

the

3741

with

K mode,

The

and

an I RS

3741 sends ENQ in place

and

then

follows

link

expanded

EOT.

Line Check (C)

A line check

bid

timeouts transmitting switched lines, it

is

on

nonswitched lines, it goes

toring

the

occurs on

or

line

when

a switch

receiving

disconnects

for

line bids.

seven receive

network

of

data.

from

into a control

the

3741

is

in a

transmit

mode,

and

one

of

the

disk: SYN, EOT, OLE,

or

SOH.

The

3741

control

character,

error

communications

or

I FS

character

of

the

response with an

timeouts

have

occurred

If

the

3741

the

line. If

the

is

mode,

data

or

during

on

the

is

read

link

15 line

terminal

moni-

the

The

mode

is

2.

error

• If a

disconnect

1.

The

mode

The

error

mode

took

mode.

Mode

Error

mode

is

at

the

answer a

can

and

Conditions

2.

If

the positioned reception automatically answer BJ, BC, 01, OJ, DC, not

conditioned

Inquiry

The

operator

SEL

lower

set

label in position 00008

BSCA

RJ, BJ, KJ,

has occurred.

timeout

has

occurred.

T,

P,

has

is

R,

RC, BT, BC, OT,

is

RJ, BJ, KJ,

R,

B,

0,

J,

occurred

KT, BT,

original position before transmission

place,

and

the

modem

telephone

If

the

mode

is

TT, TI, PT, PI, RC, RJ, BI,

JT,

JI,

KC,

to

answer a

telephone

Termination

terminate

RETURN

inquiry

TO

INDEX,

to

be displayed.

and r ndications

Characters in parentheses indicate error

indicator

position

of

the

display's

or

OJ;

or

OJ;

call if it

KI,

or

mode

what

and

a disk full

and

either:

~C,

KC,

or

and

a disk full

or

OT,

the

disk

is

conditioned

is

in an

auto

KJ,

the

modem

call.

by pressing FUNCT

thus

causing

is

displayed in

status

the

line.

to

KT.

is

or

is

data

the

Remote

A sequence

block, or following a response

transmission block

On nonswitched 3741 On timeout

Abort

(R)

remote

abort

occurs

is

received as a response

to

go

into

switched lines, a

causes

the

when

an EOT

or a disconnect

to a data

sent

after

receiving a

that

did

not

end

with

or

switched lines, an EOT causes

control

mode,

disconnect

3741

to

monitoring

sequence

disconnect

from

transmission

ETX.

for

line bids.

or a disconnect

the

line.

Message

A message

Aborted

aborted

(a)

c()ndition

occurs

after

four

consecutive negative responses have been received as responses same

data

following

Received

When

the

ing

point-to-point

~C,

JT,

KC,

responds

transmission block.

the

fourth

negative response.

Line

Bid

(V)

3741 receives a line bid while in

communications

RJ, BJ, TI, BI, 01,

with

a negative response (NAK)

The

3741

modes; RC,

P.I,

JJ,

sends an EOT

one

of

TT,

KJ,

or

KI,

and

gives a received

line bid indication.

data

the

telephone

to

the

follow-

PT, BC,

the

3741

Communications

89

Wrong-Length Check

Whenever data acters, length mode is

not label, transmits

This

ceived

characters in or cord

the

3741 has received

set

with zero characters

or

has received succeeding

within

the

same

is

selected

equal

the

from

to

the

record length specified in terminal indicates a wrong-length an EOT as a response

error

also

occurs

does

not

equal

the

receive

when a

continued

length

than

the

(W)

data

update

when

the

data

or

with

set,

mode

to

the

number

and

set

on

set

on

the

first

data

more

data

blocks

or

when

communications

and receive

the

data

of

greater

insert

constants

disk 2 has a

disk

1.

block

than

128

of

different

data

the

data

check

and

block.

characters

than

(»

program

different

of

a

char-

length

set

re-

sign

re-

• Receive record length program does data

set.

•

Transmit unattended

Unattended

• AOV

switch

• Inquiry

current

•

Selected

address

mode

data

inquiry

is

greater

is

selected from

of

the

not

match

(T,

function

print

function

is

not

is

selected

set

is

not

mode

than

update

receive

data

and

the

record length

P,

J,

or

I)

is

selected

has been selected.

selected

set

to

ON.

and

the

record length

equal

to

128.

from

update

73026.

mode

insert

and

mode

constants

of

after

the

AUTO

and

the

current

print

of

the

REC

EOO

Negative

Whenever

nect terminal

Bid

Response

the

3741 receives a negative response

sequence as a response

indicates a negative bid response.

BSCA Disk Errors

If

any

of

the

following disk errors

transmitting.or

receiving

an EOT:

• Read

• Write

• Length

• Seek

No record

•

BSCA Setup

found

Error

(H)

(X)

to a transmitted

data,

it will

occur

abort

line bid,

when

by

or

discon-

the

3741

is

transmitting

•

Selected

unattended

BSCA Disk(s)

This

• Whenever ed will

both

print.

Full

error

results

all

available record positions have been record-

into. On early

occur

when receiving

unattended

(D)

from

shipments

last received record

there

may

be

no

more

can

be field upgraded so

when

the

last record received

tact

your

IBM

representative

• Whenever

mitted

no

valid

data

the

last

data

and a continued

• Whenever, in inquiry

written

responses being

in location

written

one

of

from

is

recorded in

records

that

set labels

set

data

mode,

73026

overflow

ACL program

the

following

of

the

3741 Model 2, this

another

terminal

73026

to

be received.

this

error

does

is

recorded

for

more

information.

exist

to

of

the

transmission

set

is

indicated.

the

last received response

of

disk one,

onto

or disk

execution

conditions:

and

even

though Your

not

occur

in

73026.

receive into.

is

trans-

if

the

received

two.

and

the

3741

Con-

is

This

error

condition

mode

is

selected

•

The

terminal

positioned

•

The

keylock

• BOE

•

90

address

than

73026.

Communications the

current

results

and

one

ID

feature

past

column

is

locked.

of

the

first

mode

disk address

when

of

the

following

is

installed and

16

of

data

selected

is

greater

the

communications

the

current

set

to

be

from

update

than

conditions

the

cursor

record buffer.

received

is

mode

73026.

exist:

is

greater

and

Data Set (Modem)

Whenever has been lost

indicates a

Operator

Whenever

tion, mitting a status

an S

the

3741

after

data

set

Initiated

the

reset key

is

displayed

message.

Not

Ready (I)

detects

that

the

data

initially having ready

not

ready error.

Termination

is

temporarily

used

(S)

to

terminate

while

set

ready

status,

the

a BSCA opera-

the

3741

status

terminal·

is

trans-

BSCA Received Data Block (U)

This

error

results

when a remote

where

an

acknowledgement

transmit

Write Protect

This

mode.

error

occurs

made available

On early

shipments conditions 3741 can be

be

detected.

Error

for

were

field

Contact

(G)

when

a receive

not

upgraded

the

of

the

detected

your I BM

is

first label

operation,

3741,

so

information.

station

required

and

of

is

the

write

during

communications.

that

the

representative

sends a

the

either

write

protect

error

condition

data

block

3741

is

disk,

that

protected.

error

for

more

in a

is

Your

can

Track

and

The

track

status

line has

Modes.

T,

B,

P,

TT, PT,

R,BT,OT,KT

Sector

and

sector the

0,

J, K

JT

Indicators

number

indicator

following meanings:

Indicates Address

ledged record

00026

or,

if continued, mitted

00026

on

disk 2.

record

the

ledged record received.

on

the

display's

Position

after

the

last

transmitted.

the

last

data

last record trans-

disk 1.

after

Always

the

last

of:

acknow-

set

was

acknow-

Unattended

This

error function teleprocessing

mode

Note:

Print

occurs

and

the

is

when

the

Sector 7 of

error

cator.

MUltiple Network

This alarm beeps to

transmit munication it

should

data

(Receive) Mode. If

be

set

up

Setup

Error

when

using

the

first

data

set

complete

and

indicator

disk 1

is

displayed

Audible

when

to a 3741,

the

Alarm

host

which

in Receive Mode.

(B)

3713

received

the

3741

is

displayed.

processing

is

not

the

3741

unattended is

on

disk 2.

is

in

with

the

unit

set

up

is

to

print

error

is

attempting

in

a Com-

receive

print

The

(P)

indi-

data,

R,BT,OT,KT

with

remote

error

abort

condition

RJ, BJ, OJ, KJ

with

disk full

error

R,BT,OT,KT

with

wrong-length Record

check

or

TI,

RJ,

BI, BJ, PI, 01, OJ,

KI, KJ, JI

RC,

BC,

OC

IT

IC

Label

of

the

last

of

the

Label

if

the

a

3747.

Label or

Label next

valid label if

is

a processing

the

inquiry

disk.

blank.

are

the

inquiry disk. are

blank is

displayed.

the

inquiry

disk.

last

remote

of

the

terminal

last

valid label if

is

a processing

in

which

available valid label if

is a 3741

of

last

data

unit.

after

message was

The

data

after

message was

The

data

and

the

after

message was

'The

data

received response

message.

data

set

data

set

data

set

the

unit.

the

error

or

3747.

set

received

remote

the

address

lines

on

the

address

lines

on

appropriate

the

address

lines

show

to

an

received.

received

is a 3741

received

remote

occurred.

remote

device

where

written

the

display

where

written

the

display

where

written

the

inquiry

or

to

error

to

first

Communications

91

Status

Message

A

status

has

responded

or

responded

3741

has

of

a message.

occurs

when a transparency received incorrect ting a block receive

wrong

write

a transmission send

network,

mode

length check, disk(s) full, line check, disk accessibility,

protect,

status

message

status

The

status

format:

Format

message

prematurely

data

the

is

sent

negatively

terminated

In

transmit

block

error,

set

label,

four

times)

(R, BT, KT, IT,

or

disk

error

is

sent

or

reception

on a point-to-point

control

message

station

is

sent

to

the

remote

station

to a remote

to a multipoint

mode

check,

disk full error, disk accessibility,

or

message

condition

or

condition

when

RESET

of

data. The 3741 will

must

with

station's

select,

a transmission

(T,

P,

B,

J,

disk

error,

aborted

has been

DT) this occurs

is

encountered.

is

used

network.

the

On a

poll

for

the

following line

Displayed Error Character

K,

(after

encountered.

to

after

the

3741

line bit request,

or

after

the

or

reception

I,

or

D), this

line

check,

transmit-

In

when

a

Also,

abort

the

attempt

multipoint

status

control

to

message.

Indicator

• Clear

•

• Number

Figure 47 shows

For (0), indicating

The second mented

Error Recovery Procedures

to

send (CTS)

Number

of

the

DTR, DSR, RTS,

indicating

the

four

counters,

timeout,

each

time

incorrect

NAK's

two-second

three-second

the

condition

are

CRC's in receive

sent

the

format

condition

is

CRC, NAK, 2-second

three

the

condition

in

transmit

timeouts

of

the

and

CTS positions,

is

not

present,

position

occurs.

mode

BSC CE

present,

is

displayed.

timeout,

counters

status

line.

either a zero

or a one

and

that

are incre-

(1),

3-

E

3741 N

Q

pro- A cessing unit

Note: On

character, error

but

is

the

status

BSC CE

The

BSC CE eers, appears whenever a The

BSC CE formation

• Data

C 0

K

multipoint

a slash (/)

indicator

not

character ready. However, I ine as are

Status

Line

status

line, primarily

status

line

displayed indicates

terminal

set

(3741) ready (DTR)

(modem) ready (DSR)

S v S

o % T

H X

networks,

can

be

the

other

is

an additional

sent

with a status

is

sent

when

the

slash (/)

error

communications

on

line 6

the

t

E

T

X

A

C

K

error

message. This

the

3741

is

selected

is

not

displayed

indicator characters.

for

use by

customer

mode

is

selected.

of

the

display.

following

conditions:

indicator

on

engin-

The

in-

E

a

T

There

are several

1. Errors operator recover. An the

3741 retries

ful. (The 3741 retries read errors

displaying

2. Errors operator and recover. (This only available of

this

phone call

ning

if

the error the data beginning

3. Errors print disk 2.

error

different

for

which

there

and

from

which

example

the

read

an

error

to

for

which

there

(but

no

operator

errors

from

which

type

of

on

switched

type

of

error

type

of

error

occurs,

and

either

at

the

same place as

transmit/receive

condition

3741 will answer a

that

function

The

recovery procedures.

occurred

at

the

occur

when

while

following section explains

types

of

is

no

the

is

when a read

and

the

operator.)

is

an

intervention

the

3741 can

automatic

networks.) An

is

the

remote

the

transmit

the

mode

during

telephone

receive

usi

ng

the

first

errors

that

can

occur:

error

indication

3741 can

error

the

operation

11

ti mes

error

indication

automatically

error

abort

3741 will

or

receive original call. However, was selected,

the

receive

call

mode

start

the

3713

data

set

to

the

automatically

occurs

is

success-

before

to

the

is

required)

recovery

example

error.

When

answer

and

unattended

received

the

data

and

mode,

receive

point.

operator

a tele-

begin-

the

is

and

is

the

on

•

Request

92

to

send

(RTS)

When this the

tor

data

must

a.

error

set

is

not

perform

Place

the

occurs,

printed.

the

disk in

the

following:

b. Record advance (if necessary)

for

the

data

set

Turn

the

c. d. Press FUNCT

AUTO R

SEL

teleprocessing To

print

the

first disk drive.

you

want

EC

AOV switch

upper

and

the

to

data

to

the

print.

PRINT

is

complete,

set,

data

on.

TO

the

opera-

set label

EOO.

but

When an unrecoverable operator the mutual earlier agreed the the data on

can

examine

record location

agreement

upon

communications

set,

or

from

any

the

limitations

at

with

procedures,

can be operation,

point

of

the

communications

records

the

time

far

in

of end

or

the

by

location

restarted

from

within

the

device

at

the

data

error.

direct from the

data far

error

occurs

set

to

determine

Then,

(either

voice

the

beginning

set,

depending

end

location.

the

through

contact)

of

the

4. Errors

for

operator

which

and

the

there

3741 recovery (unrecoverable The

following sections provide operator communications cannot

After

an unrecoverable

error

recovery procedures for unrecoverable

errors

automatically

communications

intervention required) has

and

4 have

the

ability

to

under

operator

munications

•

The

beginning

•

The

beginning

•

Any

operation

point

control.

from:

of

the

of a data

within a data

is

an

error

cannot

perform

communication

information

(those errors

perform

occurred,

restart

The

error

the

communications

operator

can

communications

set.

indication

to

automatic

errors).

on

that

the

3741

recovery).

error

(operator

3741 Models 2

restart

the

operation.

the

mode

com-

For

example, if receiving cations being received ator

error

could

occurs,

use

the

is

displayed

the

search EOO last record received before record

is mitting received

displayed,

location

and

(through

begin

the

communication

point.

If

transmitting

error

occurs, transmitted operator not

transmitted

data

the

record

can inform

and

when

address

is

displayed the begin

point.

See Track mation

and

Sector Indicators in

on

the

exact

condition

occurs.

when

an unrecoverable

data

set

label

of

on

the

CRT

display.

operation

the

error

occurred.

operator

talk

can

mode)

inform

of

from

an unrecoverable

after

the

on

the

CRT

receiving location

transmitting

this

from

chapter

displayed

communi-

the

last

data

The

to

determine

When

the

trans-

the

last

record

any

desired

communication

last

acknowledged

display.

of

the

record

any

desired

for

infor-

when

an

error

set

oper-

the

The

Communications

93

Communications

Throughput

Figures

48

and

49

show typical

throughput 3741 Models 2 and 4 with and without munications feature multipoint feature, respectively. put

rates

in

terms

processed

as

a function

modem speed. The rates

The assumptions made

or

with

the

expanded

The

of

the

number

of

of records per

record size, line facility, and

listed are for information only.

in

determining the

are:

•

Setup

and line initialization sequences are

in

determining

• Non-transparent data

• Disk sequence

No

deleted records

•

Characters Per Record

the

throughput

is

01.

or

disk errors are encountered.

2400

rates.

transmitted

bps

Nonswitched* Switched**

Transmit Receive

rates

for

the

expanded

com-

communications/

figures show through-

minute

throughput

not

or

received.

rates

included

Records/M inute

Transmit

or

Receive

•

No

retransmissions.

• Propagation delay and processing unit delay are negligible.

Speed

of

•

remote device

is

equal

to

or

faster

3741.

• For two-wire lines, 200, 175, and

have

the

1200,

2000

and

2400

180

millisecond clear-to·send delays,

respectively.

•

In

equivalent

2000

bps

Switched

Transmit

For four·wire lines, the

25 and

85

milliseconds clear-to-send delays, respectively.

For figure not

Figures

used.

48

a transmit selected records program was

and 49,

throughput

Nonswitched*

Transmit

or

1200

and

2400

the

use of

System/3

of

the

2400

bps four-wire line.

1200

bps

Switched**

Receive Transmit

bps modems have

LeA

or

Receive Receive

than

the

bps modems

has

the

20 40 60

80 100 120 128

* Full duplex facility or four wire switched network

* * Two wire switched

Figure 48. Communication Throughput Rates for

Characters Records Per Record Per Block

20

40 60 80

24

12

8

6 100 5 120 128

4

3

345 260 200

160 135 115 115 110

or

Nonswitched*

Transmit

310 310 264 199 160 133 123

.175 175 175 115 115

100

110 100

90 80 75 70 65

105 180

90 80 70 65 60 55

nonswitched half·duplex facility

the

3741 Models 2

Records Per Minute

2400

bps

Switched**

Receive

160 160

163 160 160 133 123 100

Transmit

299

310

224 169 137 113

Receive Transmit

151 154 163 160 137 117 117 113 100

130 115 70 100

80 65 55 55 55

and 4 without

2000

bps

the

Expanded Communications Features

Switched

Receive Transmit

321 157 287

192 145

166 163

145

321 200

97 97 67 87

87

170

85 75 65 55

Nonswitched*

Receive Transmit

134 101

81

62

85

60 55 45

40

1200

bps

163 166

321

182 134 122 101

81 67 62

92 92 74 61 56 56

Switched**

Receive

157 166 122

74 61

* Full duplex facility **

Nonswitched half-duplex facility

Figure 49. Communications

94

or

four-wire switched network

or

two-wire switched

Throughput

Rates with Expanded Communications Features

IBM 3741 Data Station Reference Manual

Specifications and Main Features

Frequently Asked Questions

User Manual