IBM RAMAC 305 Reference Manual

The

information

programmer

(Form

No.

information

RAMAC®305 REFERENCE SUMMARY

contained

and

operator.

A26-3502).

is

required.

in

this

It

is

Reference

summary

condensed

should

is
from

be

intended

the

made

IBM

to

as

that

an

aid

RAMAC

manual

for

305

the

more

Reference

when

experienced

more

complete

Manual

© 1957, 1958, 1959, 1960 by

International

RAMAC 305

Business

Machines

Corporation

Systems

Summary

305

PROCESS

305

PROCES
DRUM

Additional printer
Additional processing tracks: U / . #
Paper Tape Input track: $

Accumulator

Add
Subtract
Read out and reset

Read out
Multiplicand
Multiplier
Input

Track

Output

Track

(Standard Machine)
Disk Memory
Address Register
Character Selector
Inquiry Track
Magnetic Core
Punch

Output

Printer

Output

(Special Feature)

Paper Tape

(Special Feature)

VALID

Unit

Track

Track

Input

output

TRACK

track: T

* Invalid Address

DRUM

TRACKS

ADDRESSES

FROM

M

L

V

*

K

S
R99

*

Q

-99
S

T

$

TO

L

M

V99
N99

K

S
R99

J

-99
Q

1299

S

T

$

COMPARING

The

following chart illustrates both valid and invalid track

addresses for compare, field compare, and combined compare.

* Yes, if

NOTE:

During

pare selectors affected.

TO

= V99 and

field compare,

MULTIPLICA

Basic

Rules

of

Multiplication

Maximum number digits in multiplier cannot exceed

Maximum number digits in multiplicand cannot exceed
Maximum number digits in product cannot exceed 20.
Product

is

developed in accumulators 0 and

Location

Units position of product
plier, minus number of positions to be dropped from product.

of

Product

EXCEPTIONS

NO.

of CHAR. = 00

TO

address determines field com-

TION

1.

is

8 plus number of digits in multi-

11

9.

* One low-order position of the product will be lost for each

digit in the multiplier beyond

Instruction Explanation

1.

Position multiplicand on multiplicand track.
xxxV99zz xxx - Track and units position of multiplicand.

2.

Execute automatic multiplication.
yyyN99zz

Half

Adjustment

The

position to half-adjust can be determined by using the
following formula:
(09)

-(

half -ad just.
NOTE:

automatic multiplication.

zz -Number

yyy

- Track and units position of multiplier.

zz -Number

the number of decimals to be dropped = position to

Accumulators 0 and 1 should be reset prior to initiating

11.

of digits in multiplicand.

of digits in multiplier.

*.

INVALID

M to R

R to J

TRANSFER

J to Any Track

INSTRUCTIONS

Speed

The

following formula may be used to compute the time re-

quired for multiplication (includes 30 ms for loading multi-

plicand).

60 +

10

(n

-

1)=

time

in

n

= number of multiplier digits.

milliseconds.

REFERENCE

SUMMARY

3

AUTOMATIC DIVISION

Basic

Rules

of

Division

Maximum number digits in dividend cannot exceed 19.
Maximum number digits in divisor cannot exceed
Maximum number digits in quotient cannot exceed 19.
Maximum number digits' in divisor plus maximum number
digits in quotient cannot exceed

20.

9.

OPERATING

370 Printer Output

80 positions
60 positions
40 positions
20 positions

Punch Output
Card Feed Input
Typewriter Output

Automatic Typing
Manual Typing (average)
Tabulations (average)
Carriage Returns (average)

(29
(36.5
(50

(84
( 100
(125

SPEEDS

LPM)
LPM)
LPM)
LPM)

CPM

max.)

CPM max.)

100
200
300

1000

2050

ms/line

1640

ms/line

1200

ms/line

720

ms/line
600 ms/card
4so

ms/card

ms/

character

ms/

character
ms/tab
ms/

return

Location

Units position of quotient is in 119.

Location

Units position of remainder in L08 minus number of digits in

excess of
of digits in divisor.)

Instruction

1. Position dividend in accumulators 0 and

xxxLyyzzb5 xxx - Track and units position of dividend.

2.

Position divisor on multiplicand track.

xxxV99yy

3. Execute automatic division.
L09P99xx xx - Twice the number of digits in quotient.

Half

Increase the number

(3)
read quotient from position L18. Remainder is also positioned
one position to the left.

sion.)
NOTE:

mum whole number
figures.

of Quotient

of

Remainder

11.

(Number

Explanation

yy

zz -Number

xxx-

yy -Number

Adjustment

above, add 5 to

If

number

of digits in remainder equal number

1.

- Maximum whole number digits
tient plus 8. (Cannot exceed 19.) Maxi­mum whole number digits in quotient is
maximum digits in dividend minus mini­mum digits in divisor plus one.

Track and units position of divisor.

added zeros.)
quotient exceeds
to right of divisor equal to number in
excess of
instruction.

of

of

of

digits, then additional digits are decimal

of digits in dividend.

of digits in divisor. (Including

If

number of digits of

11, zeros must be added

11

before execution

digits in quotient by one

119

after execution of instruction, and

(Do

not exceed basic rules

digits in quotient desired exceeds maxi-

in

instruction

in

of

of

quo-

this

divi-

Speed

The

following formula may be used to compute the
quired for division (includes
plus

30 ms for loading divisor).

100 + 20
n

(n -1)

= number

= time in milliseconds.

of

quotient digits.

30 ms for positioning dividend

time

re-

Disk

Storage

Seek time disk to disk:

SOo

ms/

Seek time track to track, same disk:

250

ms/max

Seek time record-to-record, same track:

50

ms

Transfer disk

so

ms/max.

Transfer drum to disk:

130 ms/max. 105 ms/avg. 80

Other Operating

Track-to-track transfer
Control panel test additional 20

Record advance additional 30

Skip-to-record additional
Addressing Address Register additional 20
Cycle Delay additional 30

NOTE:
tions which normally require
pleted in

Features of the RAMAC 305 are summarized below.
feature, the table indicates the number
standard machine, the units in which each optional addition may
be made and the maximum available capacity.

305

FEATURES
Character selectors
Distributors
Selectors 10

323

FEATURES
Co-Selectors
Pilot Selectors 0
Digit

Selector 1

Offset Stacker

DPBC

positions 20

FEATURES

370

Co-Selectors
Pilot Selectors
Skip Stops

*One 4S-position character selector standard.

**5-position

t2-position

Timing

max. 600

to

drum track:

ms/

175 ms/avg. 100 ms/min.

55

ms/avg. 30 ms/min.

Speeds

on

If

Program Exit Overlap

30 ms.

FEATURE

Standard

Standard Increment

Standard

avg. 400

drum

50

ms for execution may be com-

ms/

min.

ms/min.

is

installed, certain instruc-

SUMMARY

of

units included in the

Increment

3*

100

()

0

4**
0
6

3

20

,10

4**

5t

1

10

Increment

4**
5t

5

30

30

For

each

Maximum

6

120

40

Maximum

20**

lOt

2
1

80

Maximum

12**

lOt

11

ms
ms
ms
ms
ms
ms

4 IBM RAMAC

305

DIGIT

NO

DIGIT

1

2

3

4

5

6

7

8
9

11
12

CONSOLE READING AID

ZONES

CHAR

0

x

•

•

• •

•

• •

•

•

•

•

•

• •

•

•

•

•

•

•

•

•

•

• •

•

•

•

X

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

0

-

&

0

A

J

/

1

B

K

S

2

c

L

T

3

D

M

U

4
E

N

V

5

F

0

W

6

G

p

X

7

H

Q

y

8

I

R

Z

9

$

#

I!

*

%

@

CONSOLE

The

Console

(

On

Left)

operator

decipher
instruction
easi

Iy. It should

following

I.

of

2.

3.

4.

In

the

following

and 4 lights

XOl248

..

Because

the

zone

lights

chart

should
condition.
X

and

0 in
followed
sented,

which

READING AID

Reading

is

designed

the

lights

more
be

manner:

Mentally

arrive

the

numeric

For

example:

1 2 4 8

0.00
.0.0

•••

oooe

Refer

to

the

digit

which

this

sum.

Find

the

proper

opposite

this

Follow

across

letter,

or

represented

example;

are

glowing:

~

6

numeric

opposite

be

checked

The

matching

this

example}

across

to

the

in

this

{left

special

Aid

to

help

binory

quickly

used in

at

the

lights

0

chart

for

corresponds

hand

zone

digit.

to

the

character

by

these

the

lights

total

the

digit 6 on

for a

zone

should

character

case

is

the

coded

and

the

sum

glowing.

the

column}

lights

number,

lights.

X,

6,

matching

pattern

then

repre-

the

to

0,

the

letter

the

READ,

The

the test lock

2,

The

the Test Lock

WRITE,

AND

ALTER

SUMMARY

following diagrams show the sequence of operations

On

or

Off.

Test

Lock

On

1st

~

2nd

~

3rd

I Write I

TesT

Lock

Off

1st

B

2nd

8

3rd

I Write I

TEST

following is a resume

ON

and

LOCK

with

it

to

On

From

To

Parity

From

Q

On

From

Q

Q

Q

Q

Q

To

From

To

[;J

[;J

FUNCTIONS

of

console keyboard operations

OFF.

with

with

Test Lock

Make disk file inquiries during processing

when

{an

be

F.

Make disk file inquiries
Make

drum

Make

track inquiries during processing

drum

track inquiries when
Alter a record in the disk storage file
Alter a

drum

track record

Read from
Correct parity errors

drum

track

________________________________________________

not processing

not

________________________________________

"M"

(clear

____________

________
________

processing

____

____________________

Yes

accumulators) Yes

ON

OFF

No

Yes

No

Yes

No

yes

No

Yes

No No

No

No

No

Yes

NOTE:

Dual

Access

Select

Hubs,

accept

only

RAMAC

RAMAC

during

an

NOTE: Any inquiries directed to the disk storage file

processing will be replied to only as provided for in the program.

CYCLE

exit

Cycles

cycle

CHART

Timing

Chart

Delay

DELAY

Regenerated
Impulses
Emit.Used
to

Return
Stored Prog
or

Select
Access

Arm

EXI

T

REFERENCE

to

during

SUMMARY

5

Console

Operating

START-STOP

PROCEDURES

\

Starting the Machine After a
Power-Off

1.

Depress
sole

2. Depress
Hold

3.
and

4. Depress
by

5.

Place
of

6.

Place
reader

7.

If

Load
depress

Restarting the Same Job

To

restart

press

the

Starting or Stopping

To

Start:

1. Set
step.

Set

2.
operation-RUN,

3. Depress

4. Depress

To

Stop:

1.

Set
step.

2. Set

Inquiries-File

When

1.

The

The

2.

3.

Depress

4. Key

Inquiries-File

ITI0ff:

I.

Test
Control

2.

3.

Depress
Inquire

4.

5. Key

ITI0n:

I.

The

2.

The

3.

Depress

Condition

the

lights

the

the

punch

the

Ready

any

the

program.

the

operation.

the

hopper.

a

new

program

button.

the

the

reader

the

Program

the

Control

the
Program

the

Program

the

Control

Not

Test
machine

the

in

the

Lock

Selector
the
light

in

the

Test
Control

the

Power-on

have

printer

Control

Control

desired

If

reader

same

start

Program

key

turned

Start

light

the

key.

Selector switches

Selector switch to
SINGLE

Start.

Selector switches

Selector

at

on,

depress

Start

key.

key

down

is

on.

Impulse

Selector

data

is

job,

switch

or

program

to

be

loaded,

program

Start

key.

place

at

a Specific Program Step

OPERATION,

Set key.

switch

INQUIRIES

Information

Processing

Lock

must

be

must

desired

desired

Information During Processing

must

desired

comes

record

Lock

must

Selector switch

desired

off.

be

reset-depress

Format

five-digit address.

be

off.

switch

should

Format

key.

on

immediately.

address.

be

off.

Format

key.

Procedures

the

console.

until

buttons

is

already

cards

to

to

to

key.

be

should

After

the

Reset

cards

that

to

the

desired

load

depress

in

in

the

the

desired

the

desired

etc.

the

desired

CONTROL

Reset.

set

to

RUN.

be

set

cards

the

feed

to

key.

stop

are

the

machine,

STOP.

RUN.

the

con-

feeding

required

mode

in

the

Program

and

de-

program

mode

program

of

4.

When

the

IN

will

Delay

the

program

hub,

Inquiry

quiry
program
uous

When

5.
address.

Inquiries-Drum

When

Not

1.

The

Test

The

Control

2.

3. Depress

4.

Depress

Processing

Lock

the
the

ALTERATIONS

Altering Part
on

a Drum Track

I.

The

Test

Lock

2.

Depress
Select

3.
character

Depress

4.

Duplicate

5.
by

tion

6.

Type

7. Depress
completed.

8.

Depress

Depress

9.

tion

holding

to

to

the

type

be

the

the

proper

key.

the

the

down

changed.

new

the

the
any

reaches

the

Inquiry

stop.

(The

and

Exit

cycles.)

light

Cycle

turns

Information

may

be

either

Selector
Read
desired

switch

key

(read

character

TO

of

the Information

must

be

on.

Read

key.

track

by

Alter

key

to

on

the

track

information.

Clear

Write
desired

place

Q track.

information

the

DUP

key

after

key.

track

key.

key

the

step

light

will

lights

on,

on

or

is set

on

to

"Q")

key

on

DRUM

depressing

the

keyboard

on

Duplicate

all

alterations

except

which

turn

will

show

key

in

the

off.

RUN.

.

the

keyboard.

TRACKS

the

corresponding

the

typewriter

up

R.

tests

on

and

five-digit

in a condi-

to

the

have

Altering a Complete Drum Track

I.

The

Test

Lock

must

be

on.

2.

Clear

the
ing
this

3.

Depress

tion

Type

4.

5.

Depress

6.

Depress
Select

7.
character

Q track.

the

Read

order.

the

to

type

the

the
the

the

key.

TESTING

key,

Alter

on

desired

Clear
Write

desired

This

may

Space

to

place

Q track.

if

typing

by

depressing

be

bar,

the

key

the

information.

key

key.

track

PROCEDURES

accomplished

and

the

the

keyboard

less

than

100

the

corresponding

by

depress-

Clear

in a condi-

characters.

Testing Typewriter Control Panel Formats

1.

Inquiry
a.
b.
c.
d.
e.

format
Depress
Turn
Depress

Key

in
Depress
of

operation

the

the

the

the

the

Reset

selector

appropriate

desired

Program

on

the

key.
control

switch

Format

file address.

Start

key

typewriter

to

key (1,

one

time

control

FORMAT

2,

or

for

each

panel

program.

the

In­the

contin-

track

posi-

been

key

TEST.

3) .

cycle

in

6 IBM RAMAC 305

2.

Document-printing
a.

Reset
The

Turn

Depress

of

operation

the

test

the

the

b.

c.

d.

process

record

Selector

Program

on

format

must

the

Program Testing

Method I executes a program,

2

executes

stopping.

1.

2.

3.

4.

5.

6.

7.

NOTE:

during

write

File

several

program

The

Test

Lock

The

File

not

is

impossible

the

to

the
program

Interlock

be

plugged.

program

the

first

control

should
it

Turn
spond
place

Place

through a normal

After

the

gram,

TION.

When

will

If

it
and
corresponding

onto

light

processing

turn

the

the

Program

perform

the

operator

is necessary

then

type

Because

this

procedure,

the

disk

will

glow.

one

only

character

the

should

switch

to

destroy

selector

program

selector

load

program

Control

Start

program

wishes

to

out

the

File

each

storage,

Operation

unit.

be

on

Control

Start

typewriter

one

steps

or a complete

METHOD

be

1

off.

on

By

leaving

a file

switches

that

on

cards

in

load

unit

has

Selector

key is

step

to

examine a track

depress

desired

key.

Interlock

time

the

machine

may

the

switch

key

one
control

step

the

process

this

record.

is

CONTROL

the

machine,
routine.

stopped

switch

depressed,

at a time.

the

Keyboard

track

switch
the

program

be

resumed

typewriter

to

FORMAT

time

for

panel

at a time;

routine

control

switch

so

that

to

be

executed,

STOP.

on

the

to

SINGLE

by

depressing

is

not

jack-plugged

will

stop

track.

TEST.

each

cycle

program.

method

before

panel

unplugged,

they

corre-

and

proceed

first

OPERA-

the

machine

at

any

time,

Read

attempts

and

by

depress-

and

pro-

key,

the

the

to

ing

the

Check

next

Start.

Test
File

is

impossible

the

the

the

step

this

have

Because

this

onto

will

Reset

program

Start.

Reset

program

Lock

Interlock

not

be

the

program

to

the
control

processing

first

routine,

of

the

point,

been

This

may

Read

key
the

procedure,

the

disk

glow.

key,

to.

the

Program

1.

The

2.

The
should
it

3.

Turn
spond
place

4.

After
of
first

5.

At
that
order.
board

NOTE:

during
write
File

light

the

Check

the

next

Program

Track Clearing

Clearing a track

can

be

accomplished

1.

Turn

the

Test

2.

Depress
track.
tracks
propriate

To

reset

Read

The Q track

(e.g.,

track

character

the

accumulator

key,

setting

step,

should

switch

plugged.

to

destroy

selector

first

program

selector

second

the

operator

affected

be

accomplished

and

File

each

storage,

Operation

setting

step,

to

blanks

by

using

Lock

and

Space.
can

W)

the

depressing

METHOD

be

off.

on

By

leaving

a file

switches

on

unit

has

place

the

routine.

to

determine

selecting

Interlock

time

the

may

the

program

depressing

or

the

the

on.

This

now

by

depressing

key

(W

track,

program

Program

2

the

process

this

record.

that

is

to

CONTROL

stopped

program

can

investigate

by

the

proper

switch

the

program

machine

be

resumed

Program

accumulator

console

writes

be

used

in

this

depress

selector

Set,

control

switch

so

that

be

executed,

STOP.

on

the

selector

if

everything

depressing

track.

is

not

will

stop

by

selector

Set,

track

keyboard

blanks

to

blank

Write

case) .

Read

and

switches

and

then

panel

unplugged,

they

corre-

and

initial

step

on

the

the

tracks

is

the

Key-

jackplugged

attempts

and

the

depressing

switches

and

then

to

zero

as follows:

on

the

out

other

and

the

ap-

M.

in

to

to

Q

REFERENCE

SUMMARY

7

Error Correction Procedures

PROCESSING

Parity

Console Indication:

Cause:

Restart

cycle,

the

Clock

Console Indication:

Cause:

Restart Procedure:

Check

1.

Processing
Parity

2.

Improper

PTOcedure:

1.

If

the

the

machine
on.
depressing
possible
and

2.

If

the
chine
Check
sary

tion
accumulator
data
used
necessary

struction

If

an

indication

To

correct

providing
following
a.

Depress

b.

Read

100
contains

c.

After

key.
page

d.

Type

e.

Depress

been

f.

Depress

Depress

g.

3.

If

the

will

Reset
a

read-in

tion

core

the
comparing
tion
sible,

step

tion

Error

I.

Processing
CLOCK

2.

Some

phase

1.

Make
NOTE:

light

character

parity

The

operator

because

the

records

parity

will

Reset
unless
is

involved.

is

retained

as

an

so

error

an

procedure

the

characters

the

This

and

any

completed.

parity

stop

and

has

occurred,

unit.

core

unit.

and

the

where

can

be

ligh t on.

a.

note

The

stops

on.

Check

stop

and

an

aid

to

that

persists

that

an

the

an

full
will

stop

the

the
program

check

with

Program

to

an

Depress

the
the
program

the

started

Stop

Stops

of

console

Stop

(Red

transfer

check

occurred

will

stop

may

Reset

no

information

in

the

check

occurred

with

the

Program

accumulator

If

read-out

has

been

in

the

to

reconstruction.

restart

the

the

accumulation

on a track

the

source

invalid

accumulator

may

Check

track

that

on

the

error,

it
track
cause

under

corrections

clear

write

key.

start.

occurred

the

TO

Start

accumulator

transferred

Check

It

may

accumulator

source

record.

should

accumulator

over

(Red

machine

of

the

program

may

character

Reset

key

CYCLE

be

timing

ERRORS

Stop

light

within

on

with

the

INSTRUCTION

attempt

and

then

machine

FROM

reset

will
has

the

Stop

has

have

on

the

CYCLE

Start

may

read-out

and

to

zero.

magnetic-core

program

to

data

is

occurring

operation

be

used:

key.

contains

track

are

be

automatically

been

typed,

typewriter

the

first

invalid

that

are

after

the

on

the

light

is

all

that

is

involved.

data

Reset

and

possible

data
However,

be

restarted

is

reset

again.

light

is

out

step

not

indicate

on)

.

the

processing

the

INSTRUCTION

the

transfer

Program

actually

not

FROM

light

be

all

and

reset

has

The

unit

It

will

at

some

can

be

track

transfer,

incorrect.

is

the

parity

typed,

depress

to

character.

required.

last

TO

cycle,

on.

Depressing

is

necessary

If

is

in

make

to

correct

with

the

if

at

and

on)

.

of

step.

involved.

the

CYCLE

Start.

transferred

been
CYCLE,
on.

Depressing

that
reset
occurred,

accumulator

and
normally
previous

built

on

not

and

if

underlined.

space

correction

the

an

the

an

the

core

this

some

the

error,

unit.

cycle,

light

again

This

affected.

the

ma-

is neces-

instruc-

can

up

again.

it

is

the

FROM

involved,

error.

the

track

the

alter

across

machine

Check
unless

accumula-

magnetic-

inquiry

error

informa-

is

not

pos-

previous

accumula-

until

by

is

the

be
be

in-

an

All

the

has

of

by

the

following
must
dicated

2.

Depress

3.

Investigate
and
written

4.

If

tions,
program
mulation

5.

Investigate
cuted
duplicated.
punch a card,

Set

6.
and

Start

7.

File

Check

include

preceding

either

it

to

the

press

the

program

and

the

Reset

the

in

the

or

both

may

where

can

the

insure

For

Program

program

program

Stop

Console Indication:

1.

Processing
File

2.

Check

Stops

light

Cause:

Record

just

data

on

NOTE:

and

will

the

process

on

every

Restart

1.

Depress

2.

Depress

3.

If

typing
that
the
re-entered
at
storage.

Feed

stored

drum.

Accumulator

always

panel

file

write

Procedure:

Check
Program

the

error

out

is

the

source

error

condition

on

an

instruction

Check

cause a File

persists,

the

Stop

Console Indication:

1.

Processing

2.

Feed

Check

Stops

light

Cause:

Misfeed
leave
should

Restart

1.

2.

3.

4.

5.

6.

Read

in

and

arrive

affect

Procedure:

Depress

Remove
Remove
Run

out

Process

Runout

Restart

by

card

failed

unit)

in

processed.

Depress

Check

the

only

Reader

the
any

the

placing

to

front

the

Stop

Console Indication:

1.

Processing

2.

Read

Stops

Check

step.

at

also

program

wrong

be

begin

etc.

are

operation.

Reset.

the

card
at

one

cards

jammed

remaining

feed

Reader

light

Therefore,

least

the

the

preceding

key,

not

TO

address

place.

of

these
necessary
the

accumulator

again.

program

that

information

example, a slide

Selector

set.

by

depressing

(Red

Stop

on.

on

disk

read-out

not

wired, a File

Start.

the

disk

storage

of

the

has

drum

that

will

(Red

Light

on.

reader. A check

each

feed

card

that

Stop.

from

cards

key.

the

last

from

of

the

remaining

Start

(Red

Stop

on.

step

on

step.

the

Check

track

step

to

steps

are

to

restart

steps

which

to

start

light

file

does

and

reset

Check

stop.

information

record

record

being

been

corrected,

track

and

transfer

on)

station.

has

not

the

feed

from

cards

by

three

the

feed

key

to

light

the

restart

which

Reset.

of

both

be

sure

accumulator
at a position

is

reset

are

will

not

operation,

at

the

Program

on)

.

not

agree

to

the

If

the

Check

can

and

the

transferred.

the

the

program

the

.

is

made

Therefore,

been

hopper.

the

feed.

depressing

cards

(two

hopper

cards

run

the

on)

.

procedure

the

error

the

error

data

was

and

the

to

be

re-exe-

be

lost

feed a card,

restart

Start.

with

file is

invalid

FILE

hubs

stop

will

be

retained
drum

data

can

restarted

record

to

as

the

any

processed.

the

cards

into

the

that

are

cards

in.

is

in-

step

not

opera-

in

the

accu-

or

point,

source

on

occur

by

track

After

be

disk

cards

jam

Non-

if

the

feed

to

be

8 IBM RAMAC

305

Cause:

An

error

in

Restart

1.

Depress

2.

Remove

3.

Depress

NOTE:

of

4.

The
not
of
depress
reader.

reading

Procedure:

Reader

the

Non-Process

The

the

deck

last

three

processed;

the

remaining

the

cards

card

in

the

therefore,

Reader

or

Stop.

in

error

stacker,

cards

cards

recoding

from

Runout

to

Start

the

is

the

after

run

place

that

feed

are

Key

the

to

third

the

out

these

input

hopper.

clear

cards

of

to

to

run

the

card

the
three
be

processed.

Interlocked Track (Input or Output)

Console

Cause:

track
it

Restart

Indication:

1.

Processing
Interlock

2.

3. Select
Punch

Programming

before

has

called

Print

or

Procedure:

1.

Determine
cards
depress

2.

If

the
dition:
a.

Depress

interlocked
b.

Process

ure

Stops

light

light

for

or

Type)

has

the

last

for a transfer

Punch

operation

if

or

paper.

the

corresponding

interlock

the

through a normal

as

described

PRINTER

(Red

on.

interlock
.

called

for a transfer

feed

operation

to

is

the

interlock

If

so,

replenish

is

due

to

console

instruction.

Check

in

Console

Stop

light

device

the

output

completed.

is

due

input

an

input

Reset

track

Operating

ERRORS

on)

.

on

(Reader,

to

has

been

track

to

running

the

cards

or

output

or

output

key

investigation

card.

feed

from

the

are

run

machine

cards

in

cards

into

or

from

completed,

before

or

paper

Start

error

to

drop

Procedures.

station.

back

out.

were

front

Then

the

Printer,

the

or

the

last

out

of

and

key.

con-

out

the

proced-

a.

Try

2.

Repeat

NOTE:
Print
of

b.

If

track

c.

If

line
during
may
line

NOTE:
instances

A-N.
a.

At
for
sary.

b.

The

set

printing

the
the

the

may

have
typing.

Stop.

the

deltas,

Check

key

the

Switch.

If

the

Repeat

printer

switch

MLP.

error

appears

(see Console

document

be

crossed

future

use

to

be

Reprocessing

because

end

of

the

and

make

light

on

the

printer

line

must

Operating

is

for

out

of

the

redone

of

run,

manual

will

again

is

in

again,

internal

or

document.

either

will

file

updating.

examine

remain

is

depressed.

by

depressing

an

MLP

be

depressed

investigate

Procedures).

all

delta

by

not

be

the

corrections

on

operation,

for

the

purposes,

lines

disregarded

Other

practical

output

where

the

documents

documents

Check

reprocessing

until

the

each

output

the

in

Print

line

error

or

off-

most

neces-

Re-

the

Form Light

K

Console

Printer

Cause:

Restart

Indication:

1.

Processing
tion

(Red

2.

Interlock

3. Select

Printer

Indication:

Form

light

Botton

of

Procedure:

1. Successive
the

printer

the

last

2.

Insert

new

3.

Depress

stops
Stop

light

light

on.

last

form

depressions

to

print

form.

forms

the

printer

on
light
on.

is I

and

the

next

on)

on.

Y2

of

another

align

Start

transfer-to-Qutput

.

inches

from

the

printer

line

in

to

first

key.

print

Start

order

printing

key

to

stick.

will

complete

line.

instruc-

cause

Print Check Error (Parity or Print Setup Error)

Console

Printer

Cause:

Restart

Indication:

Depends

1. A

-N.

~2.

A

-Stop

a.

Processing
struction

b.

Interlock

c. Select

Indication:

1.

A-N.
a.

Check

b.

Delta

c.

Printer

2.

A-Stop.
a.

Check

b.

Delta

c.

Printing

3.

Stop:

1. A parity
output

2.

The

print

Procedure:

1.

A-Stop

on

Stop:

or

Stop.

Same

track

and

printer

No

Stop.

stops
(Red
light

Printer

light

printed

continues

light

printed

stops

as

error

to

stick

Stop.

control

console

on

Stop

on.

light

on.

in

the

on.

in

the

after

A-Stop,

was

sensed

the

may

Depress

panel

indication.

the

light

on.

left

to

print.

left

the

but

printer.

not

have

wiring.

next

transfer-to-output

on)

.

margin

margin

error

line

no

delta

during

the

been

Printer

of

the

of

the

is

is

printed.

transfer

set

Check

line

in

line

in

completed.

from

up

properly.

Reset

error.

error.

key.

in-

the

PUNCH

Punch-Parity Error Stop

Console

Punch

Cause:

cluding
check.

Restart

again.
cedures

Restart

Indication:

1.

Processing

tion

2.

Interlock

3. Select

Indication:

1.

Punch
Parity

2.

One

or

those

Procedures:

In

general,

If

may

Without

1.

Depress

2.

Read
track

will

3.

Depress

stops

(Red

Stop

light

Punch

stops

light

more

of

not

the

the

error

be

used.

the

the

output

are

typed,

be

automatically

Program

on

light

on.

light

on.

at

the

on.

the

100

being

operator

continues,

Clearing

380

Console
track.

and,

Start.

the

on)

end

positions

punched)

should

the

All

if

underlined.

ERRORS

next

transfer-to-output

.

of

the

punch

of

the

failed

try

either

of

Feed - Correct

Check

Reset

100

characters

the

track

contains

REFERENCE

cycle.

-output

to

to

punch

the

key.

track

pass

the

the

following

Later

on

the

an

SUMMARY

instruc-

parity

card
pro-

output

error,

(in-

it

9

4.

Remove
finding
Reset
stacker
manually.

Correct

1.

Depress

Read

2.

3.

After

4.

Type

5.

Depress
completed.

6.

Depress

7.

Depress

8.

Remove

press

cards

9.

Remove

into

lO.

Place
input
first

output

programming

Punch

Console

1.

Processing
tion

Interlock

2.

3. Select

Punch

Feed

Cause:

Full

Restart

A.

Empty

I.

Place

stacker.

2.

Depress

B.

Feed

1.

Remove

2.

Depress

3.

Remove

will

this

4.

Replace

sary, a

5.

Depress

C.

Feed

I.

Remove

2.

Remove

the

cards

the

error

and

Start

is

the

the

Error,

then

the

380

the

output

the

full

track

any

corrections

the

Clear

the

Write

Program

the

cards

the

Punch

out

of

the

the

error

the

stacker.

the

last

deck

if

card

in

on a run-in

track

information

proceeds.

Feed-Check

Indication:

stops

(Red

Stop

light

Punch

light

Indication:

Check

light

stacker,

an

empty

Procedures:

Hopper

cards

in

the

Punch

Failure-Misfeed

cards

Start

key

the
be
card

Failure -to

last

repunched

is

retained

the

unpunched

gangpunch

the

Start

the

cards

any

damaged

from

the

card,

and

keys.

in

The

error,

card

Restart

Console

track.

has

been

that

key

after

key.

Start.

from

the

Check

Reset

machine

card,

which

correct

gangpunched

punched

is

Stop

on

the

next

light

on)

on.

on.

on.

hopper,

or

Full

Stacker.

the

hopper

Start

from

from

hopper.

to

clear

punched

because

on

the

master

key.

Feed

Into

from

cards

punch

depress

second

and

it

Check

Reset

typed,

depress

are

required.

the

last

323

Punch

key.

with

the

will

card

data

must

not

punched.)

punches

.

key.

cards

card

the

into a new

transfer-to-output

or a feed

or

remove

Hopper.

feed.
card.

The

the

information

output

in

the

precedes

Punch

Brush

hopper.

and

clear

stacker

the

punch

card

to

may

be

key.

the

correction

hopper,

Run

the

Start

key.

be

the

in

front

be

saved.

The

failure.

cards

last

punched

track.

hopper.

these

Station.

the

to

facilitate

Check

reach

corrected

Alter

has

been

and

remaining

second

of

(The
corrected
card

instruc-

from

concerning

If

neces-

cards.

feed.

the

key.

de-

card

the

and

the

card

3.

Remove
aged
because
on

4.

Replace
punch

5.

Depress

DPBC

Console

1.

Processing

tion

Interlock

2.

3. Select

Punch

DP & BC

the

card) . The

the

the

output

the

master

the

Error

Stop

Indication:

stops

(Red

Stop

light

Punch

Indication:

light.

information

Start

Cause:

Either a double-punch

has

occurred.

in

error
indicate
an

error

Restart

If

the

reconstruct

been

replaced

This

can
processing
In

some

the

output
cycle.
and

correct

If

the

must

be

Two

are:

No

Gangpunched

I.

Depress

2.

Depress
be
depressing
corrected

Gangpunched

1.

Remove

2.

Depress

3.

Depress

into
ually.
punched

4.

Place
master
with

When

has

passed

that

either

occurred

Procedures:

output

the

on

usually

drum

cases

it

data

Then

the

the

DPBC
cleared

methods

the
the

resumed.

Field

the

Check

the

the

stacker

The

on

the

gangpunch

the

Start

punching

output

the

be
tracks,
may

on a working

operator

card
stop

and

for

punch

the

manually.

second

last

last

punched

last

track.

cards

card

key.

on

light

on.

light

this

the

the

in a gangpunched

output

accomplished

be

manually.

was

the

restarting

Fields

punch

The

Start

Checked

cards

Reset.

Start

is

the

run-in.

correct

key.

card

punched

concerning

in

the

hopper.

precedes

the

next

on)

.

on.

or a blank-column

type

of

punch

brush

output

punching

is

at

because

or

fault,
the

track

by

checking

desirable

track

can

investigate

caused
operation

the

METHOD

Checked

Check

Reset

Start

key.

first

card

key is

the

METHOD

for

from

the

key

to

clear

in

error

card

and

is

not

card

information)

The

first

(this

may

card

will

be

this

card

If

these

transfer-to-output

error

with

by

I

for

to

necessary, a

cards.

is

signaled,

station.

is

incorrect,

field.

it

may

information

the

by

succeeding

investigating

the

printed

to

carry,

for

punch

in

one

additional

the

gangpunching,

restarted.

after a DPBC

DPBC

key.

Continuous

reach

the

card

in

error.

error

The

be

working

operation

2

DPBC

feed

hopper

the

feed.

error,

and

in

The

be

corrected

but

of

the

run

is

not

in

card

must

in

front

be

the
repunched
is

retained

instruc-

(or

the

error

necessary
in

error

the

document.

the

program,

the

stacker

It

must

and

stacker.

first

will

deck

the

cards

punched.

dam-

gang-

both)

card

can

or

that

to

has

record.

file

or

punch

track

feed

stop

will

after

be

card

man-

be

re-

(for

in

10

IBM RAMAC

305

Control Panel Summary

EACH

under

SECTION

which

of the control panels is assigned a number

the

hubs are briefly described. Shaded areas indicate

special features.

Process Control Panel (Figure 1)

1.

Program
corresponding program exit occurs
is used to make tests on the control panel, and to transfer
program control to the first step

When
and

must

pulsing

When
lower exit hubs
hub

was impulsed last.

2.

Dual

Dual

Access operation.
to the SEL (select) hub, the access arms operate
sequence mode.

o

(zero)

Delay

or

CI

(control

switch.

Record Advances, Skip-To-Record, and R instructions until the
other

access

wired

to

function

DPIS

3.

hub

of

it

suspends the interlock

until the arm

address.
panel, it suspends the interlock for both systems; however, only
the system initiating the suspension can re-establish
by impulsing
tems, the
When
instruction causes a file check. A light on the console
system indicates

4.

ALC

plugged

and

the last card has passed the second reading
card reader
key, and feed

depresses the Start key, the last card selector transfers.

If

the ALC switch is plugged, the card reader

for one additional cycle before stopping.

cycle the last card selector transfers,

that

have been programmed utilizing the last card selector can be
completed.
ing

the

Inquire.

5.

jackplugged if manual inquiries to the disk records are to be

allowed

The
console to take control
not

countermand the stored program instructions.

interlock is

Exits. These hubs emit an impulse whenever the

in

an instruction.

of

one

of

these hubs emits, the program sequence is halted,

a new sequence

The

of

instructions.

be restarted by impulsing program advance

program entries.

Program Exit Split

of a group

is

installed, either the upper

will emit depending on which control

Access. These hubs provide control over the mode of

When

the C

(common)

With

the C

hub

or

1 hub may be impulsed from a Program Exit, Cycle

any

other

impulse originating on the 305 panel, except

impulses),

The

corresponding access

unit

hub

access

of

the

is impulsed.

unit

Process

the

other

PU

hub

either

as

a single access system using this unit.

(Dual

DPIS

is impulsed by either system

When

wired to the SEL hub, either the

and the

upper

unit

If·

(0

the C

or

Suspend).

hub

Interlock

that

prevents reading

system has moved from this same

is impulsed on one process control

hub is not wired

in

the automatic

hub

of

the Inquiry

will then accept all

hub

1)

is permanently

the system will then

When

in

Dual

System Control,

or

writing

the

the

DO hub.

DO

hub

on both process control panels must be impulsed.

a system impulses

when

(Automatic

(when

the cards have

If

PU

has been impulsed

PU,

it

cannot write in the file; a write

on

the interlock is suspended for that system.

Last

Card).

If

run

the ALC switch is

out

of

the card reader hopper,

brushes),

will

stop.

The

operator may depress the Reader Start

the

last cards to the stacker.

Just

after the operator

will

During

this additional

and

any last-card routines

The

cards may then be fed into the stacker by depress-

Reader Start key.

The

pair

of

during

processing.

IN-OUT

hubs form an interlock

hubs marked

of

the access arm

ON

form a switch that is

that

is wired to allow the

at

a time

when

The

wired

in

the program

at a point

where

the

impulse

or

by im-

or

ON

the

PU

a record

interlock
both sys-

of

each

not

the

feed cards

it

will

inquire

access arm

has completed its use
moved by the program, no harm will be done

of

the record.

If

the arm is about to be

if
moves the access arm to some other record to make an inquiry.
When

the record has been obtained

for

the operator, the stored
program resumes control and moves the arm to the next record
required.

A

program

from

sole

or

the

OUT

6.

to make inquiries to the disk records

typewriter may also be used as a secondary
dressing the

control panel (see item

the

OUT

is

delayed

hub

ITI

(Inquiry-Type

output

exit

wired

into

the

IN

hub

is

if

if

wired

no

inquiry

an

inquiry

to

initiate

Interlock).

has

is

the

hub

been

set

The

as

record to Q track and impulsing

33).

If

both

of

emerges

set

up

up.

The

next

impulse

program

typewriter may be used

described in item 5.

output

these uses occur in the

same program, the inquiry-type interlock must be jackplugged to

prevent an inquiry from taking place while the typewriter is under
program control.

7.

File

grams may be tested

disks.

When
to allow
writing

A write operation

J,

8.

Accumulator

Interlock.

the

on the disks may be performed

This interlock is provided so that

without

changing the information

a program has been checked out, this switch is wired

disk records to be changed. All operations except

with

will

cause a file check.

the interlock off.

Sign. Each accumulator has an associated

selector that shows its sign. By using a program exit impulse, a

test may be made to determine
at zero,

or

is negative.

Accumulator

9.

Overflow.

if

an accumulator is positive, stands

Whenever

an accumulator over-

flows (tries to accumulate a number beyond its capacity), a

is established between each
remain set
out

IN

dropped

of

up

until

by impulsing DO. A normal

hub and the corresponding

out

or

when no overflow has occurred.

Character

10.

Selectors

analyzing any character on a

analyzed is entered into this

(-99)

as

the

TO

address. Any character entered establishes test

paths between each

IN

hub

the

accumulator overflow selector is dropped

..

IN

hub

and its YES hub.

path

is established between the

NO

hubs

when

The

character selectors provide a way

drum

track.

unit

by an instruction

The

and the exit hubs corresponding to

the character entered.

Four

distinct

paths

are set

up

on the basic machine.
the paths are arranged so that a test impulse entered into
hub

emerges from

of

the character being tested.

into the

IN

the

specific letters, numbers, and special characters

blank).

The

the

hubs corresponding to the

In

hub

emerges from one

the fourth path, an impulse wired

of

the 48 exit hubs representing

test paths remain set up until another character is

addressed to the unit.

The

special feature X

analysis

for

the presence

no-X

or

and 0 no-O

absence

of

these bits

bit

selectors provide

in

sent to the character selector.

Blank

11.

struction causes

NO

condition.
during
selector
the

380 Console will be
ferred

Transmission.

the

If

the information transferred

the execution of the instruction is all zeros

will

transfer to a YES condition and the

and

the

light

will remain on until another instruction

A 6

in

the tenth position

Blank Transmission selector to reset to a

from

the core storage

turned

on.

The

selector will remain trans-

BLANK

a 6 is read.

the operator

immediately

at

the

con-

from

step.

The

printer

by ad-

TYPE

on the

new

pro-

on

the

path

These

paths

the selector is

position to be

with

hyphen

Three

of

the

IBM

IN

card code

(including

the character

of

an

in-

or

blanks, the

light

on

with

REFERENCE

SUMMARY

11

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Figure

12

IBM RAMAC

305

1.

305 Process Control Panel

12. Last Card. This selector is used to control machine opera-

tion on the run-out. Normally, a path exists between each
and the

NO

hub beneath it.

When

the cards have

run

IN

hub

out of the
card reader hopper, and the last card has passed the second read­ing brushes,·
depress the Reader
After the

if

no more cards are to be entered, the operator may

Start key and feed the last cards to the stacker.

Start key has been depressed to initiate an additional
feed cycle, the last card selector transfers. The program control
may be wired through this selector to control the last card routine.

13. Compare. This selector stores the result of the last pro­grammed comparison. A path
the

=

(equal)

hub beneath it whenever the two fields are exactly

equal, and between the

is

set up between each

IN

hubs and their

=I=-

(not

equal) hubs

IN

hub and

when the two fields fail to compare. These paths remain set up
until another programmed comparison is made.

14.

Field

allow,

with

one instruction, from one to ten fields on the track
specified by the
the fields of a track specified by the
may refer to a process drum track, a disk track,

Compare.

The

TO

address may specify any process drum track other than
the accumulator track. Neither the core
be used

as

the

TO

of the instruction to cause automatic field comparing.

The

field compare device is provided to

FROM

address to be individually compared

TO

address.

The

FROM

or

the core unit.

unit

nor the disk file may

with

address

address. A 2 code is placed in the tenth position

The

results
of a field comparison will be indicated in the ten selectors associ­ated with the field compare device.

15. Communication. These hubs are connected to the cor-

respondingly numbered hubs of the communication section on
the printer, console

(TW),

and punch control panels, they allow

for signal communication between the machine units.

16. Start.

When

the first input card after any run-out except
non-process run-out has been read and checked, an impulse
emitted from this hub. This impulse is used

in

the same manner
as a Program Exit impulse to start the stored program at the de­sired instruction.

17.

CI

(Control

Impulse).

Two buttons are provided on the
operator's panel at the console to allow a control impulse to be
emitted on the control panel. This allows the operator to pick up
or

drop out selectors,

or

initiate other functions from the console.

These impulses are emitted from the correspondingly numbered

CI

hubs on the control panel.

18. Skip-To-Record.

When

one of the numbered hubs associ­ated with Skip-To-Record is impulsed, the access arm remains on
the same disk and track,
so

that the units position of the disk address corresponds to the

but

the disk address register

is

advanced

number of the hub impulsed.

After the corresponding address has been

register, the

OUT

hub emits.

This

impulse

set

up in the address

is

wired to restart the
program. Normally, this device will be used in conjunction with
field compare.

19. Copy.
automatically transfers the contents of the
of

the program storage tracks.

instructions, this records instructions

hub

may be impulsed from the

When

an impulse that

Usually

20.

group

21.

When

the

copy

IN

hub is impulsed, the machine

If

the

input

190-197

START

hub.

the transfer to track I is completed, the

is

wired to start the stored program at any step.

it

is wired to start the program

Reset.

When

impulsed, this hub causes the corresponding

of

ten selectors to be dropped out.

Alteration.

A row of switches on the operator's panel at

at

input

track to track I

card is punched with

on

track

I.

The

OUT

hub emits

step 190.

IN

the console is provided to allow various changes to be made in
the program setup by changing the settings of the switches.

On

the control panel, these switches are wired in a manner similar to

selectors. Program exit impulses wired into the
from the
responding toggle switch
from the

may be used for control functions, such
of selectors.
from the

N

(normal)

T (transferred) hub if the toggle switch is transferred.

22.

Cycle Delay. These units provide a delayed impulse that

hub

of

the same vertical row

is

in

the normal position. They emerge

as

An

impulse wired into the cycle delay

OUT

hub thirty milliseconds later, where

IN

the pickup and dropout

IN

up or drop out selectors after the control impulse has ended.
Whenever Cycle Delay
vanced by the delayed
hubs may be located at

is

impulsed, programming must be ad-

OUT

impulse. Additional Cycle Delay

AF-AH,

6-20

if

Input

Analysis selectors

are not installed.

23. Analysis Selectors. These selectors analyze designated

input card columns for specific codes. Two
to each selector.

One

PU

hub

is

PU

hubs are connected

wired from the
Control Exit to be tested for the code; and the other hub
wired from the CARD CODE to be detected.

When
receive the same digit impulse, the selector transfers and remains
transferred until the next feed card instruction. A blank column

PU

can be detected by wiring both

TRACK

CONTROL

EXIT;

transmission of any card code causes the

hubs from the same

selector to transfer.

24.

Selectors. Latch-type selectors are furnished to provide for

storage and control of operations. Each selector position has a

COMMON,

connected to the
impulsing the
to the
Group

Selectors and Isolators are

is

address register one sector per impulse. This feature

NORMAL,

TRANSFERRED

D selectors may be added at BG-BR, 11-20 if

25.

Record Advance. These hubs advance the address in the

NORMAL

PICKUP

and

TRANSFERRED

hub until the selector

hub.

Then

the

hub until the

not

installed.

hub.

COMMON

DROPOUT

The

COMMON

is

hub is connected

hub

mainly to obtain additional sectors where a record is spread over
more than one sector.
dress in the address register
track.

When

the advance is completed, the
pulse that is wired to restart the program.
from sector 9 to sector

26.

Distributors.

When

the

IN

hubs are impulsed, the ad-

is

advanced one sector on the same

0, the olF hub emits instead of the

OUT

hubs emit an im-

When

the advance goes

Impulses that are used to initiate several
functions are wired through distributors that serve the same
function

impulse wired into the

associated

hubs,
that from the

as

or

from an

split wires

OUT

hubs,

OUT

but

IN

hub of a distributor

but

OUT

impulses cannot travel between

hub to the

hub

of

prevent possible back circuits.

is

available at the

IN

hub. Any impulse except

another distributor may be wired

through a distributor.

27.

Program

when the control is brought to the control panel

Advance.

The

stored program sequence is halted

as
impulse. To restart the program at the next higher step, the Pro­gram Exit impulse is wired to impulse Program Advance.

28.

Program

Entry.

When

the program control has been
brought to the control panel on a program exit, a new program
sequence may be started by impulsing the appropriate program
entries.

The

hundreds program entry is impulsed only when
sired to change program steps from steps below number
steps above

The

units hubs that correspond to the number

100,

or

vice versa.

new program step is set

up

by impulsing the tens and

of

the program step

desired. Distributors should be used.

Program Entry Isolation removes the common connections be-

tween the entry hubs, and internally connects a distributor in series

with

each hub. This eliminates the requirement for wiring a dis-

tributor

in

series

with

each entry hub.

hubs emerge

if

the cor-

hub emerges

it

may pick

Input

Track

both

PU

INPUT

hub

picked up

is

impulsed.

Input

Analysis

is

an electrical

it

is de-

100 to

is

hubs

is

by

used

OUT.

An

OUT

REFERENCE

SUMMARY

13

29.

Feed

feed a card past each station.

Card. Impulsing these hubs causes the card reader to

The

card passing first reading is
automatically coded and recorded on one input track, while the
card passing second reading is checked against the recording on
the other input track that was recorded from that card on the
previous card-feed cycle.
has been checked, its input track

When

the card passing second reading

is

made available to the process-

ing unit.

30.

Print.

Impulsing these

hubs'

causes the printer to

print

from the output track. Format control on the printer determines

the arrangement of the printing.

31.

Stop.

When

stop.

If

the program
which impulses
the Program

these hubs are impulsed, the program will

is

STOP,

advanced with the same program exit

the program may be restarted by depressing

Start key.

32. Punch. Impulsing these hubs causes the 323 Punch to

punch from the output track.

Wiring

on the punch control panel

determines which columns are punched.

Type.

33.

to

print

on

the typewriter control panel determines the arrangement in

Impulsing these hubs causes the console typewriter

the information recorded on the Q track. Format control

which this information is typed.

34. Reset Stop. These hubs may be impulsed from a stored

program exit impulse

when

processing is to be halted. Impuls­ing these hubs resets the processing unit and places the machine
in an inquiry-only mode
made. Restart by depressing the Reader

of

operation

so

that inquiries may be

Start key with cards in

the hopper and the feed clear.

35. Isolators.

Two

IN

hubs and one

OUT

hub in each Isolator
permit two similar impulses to be combined without interaction
between the two sources.
to combine two Card Codes or two
The

OUT

hub then emits the two impulses in the sequence in which

they were received.

wired to the

IN

hub

in this manner decreases the reliability

36. Eliminators.

are used to prevent the writing

track.

The

Input

Track Control Exit is split-wired to the Card

The

IN

hubs of the Isolator are used

Input

Track Control Exits.

The

OUT

of

Four

hub of one Isolator should

another because connecting two Isolators

of

the

OUT

impulse.

Eliminators, with two entry hubs each,

of

a specific card code on the

not

input

be

Column Entry to be screened and to one hub of the Eliminator.

The

other hub

CARD CODE to be eliminated.

Card

37.

same sequence

card. These hubs must
wired to the same entry, they must be wired through an

38.

Input

the card column to be written

of

the Eliminator is then wired from the specific

Codes. These hubs emit card code impulses in the

as

the corresponding codes read from the input

not

Track

be split-wired; when two

Control

Exits. Each

in

a specific track location by an

of

these 100 hubs selects

or

more

ISOLATOR.

are

impulse wired to the corresponding Card Column Control Entry

hub. Any track position

Card

39.

Column

impulses from the

not

wired will be blank.

Control

Input

Entries. These 80 hubs receive

Track Control Exits to indicate to

which track position each card column will be sent. Any card

column not wired to an
send data to the

input

Printer Control Panel (Figure

1.

Print

print

Control

line. Each

hub

five

emits an impulse every time

the printer is positioned to
the
example,

Input

Track Control Exit will not

track.

2)

Exits. These hubs emit control impulses

print

hub

emits one impulse per line printed; for

the corresponding positions of

print

position

five

is being set up. These impulses are wired to initiate functions such

as zero suppression, X-elimination, etc.

2.

Distributors.

Impulses that are used to initiate several
functions are wired through distributors that serve the same
function

impulse wired into the

associated

hubs,
that from the

as

or

from an

split wires

OUT

hubs,

OUT

but

prevent possible back circuits.

IN

hub

but

OUT

hub

of a distributor is available at the

impulses cannot travel between

hub

to the

IN

of

another distributor may be wired

hub. Any impulse except

through a distributor.

3.

Analyzers.
track, and
by a control code, the
before the

When

PRINT

print

a record has been transferred to the output

on the process control panel has been impulsed

printer

prepares to

print

a line. However,

mechanism moves from the home position, the

output track may be analyzed.

By wiring from the
track position, the digit
output track will condition the analyzer

Exits will emit in IBM code.

1 exits emit for an A, etc.

position,

and

4.

BLANK

4.

MLP

(Multiple-Line

ACI

hubs

or

character in that position

The

If

ACI

will emit on each

Print).

of

an analyzer to an output

so

2 exit emits for a 2, the 12 and

is

not

print

The

that the Analyzer

wired to an output track

cycle except MLP 2, 3,

MLP function controls

the printing of multiple lines from a single output record.

START hub corresponding to the number

pulsed from an Analyzer Exit.
impulse at the beginning
sequence 1, 2,

(If

the special MLP Repeat feature is installed, the additional

MLP I hubs 5 through

3,

and 4,

8 emit

The

of

the corresponding MLP line,

up

to the number of lines desired.'

in

of

lines desired is im-

MLP I hubs then emit an

sequence for the corresponding
repeat lines.) These exit impulses can be wired to pick up Line
Program
print

hub

or

Co-selectors to control the format on the corresponding

line.

Print

MLP RPT. (Multiple-Line

Repeat). Impulsing the

serves to hold the 370 in MLP status after the initial
lines are printed, and initiates printing of the first repeat line.
The

OUT

(same time

wired to MLP

the analysis portion
MLP
operation, the MLP

IMPULSE

provided to allow format control

hub emits an impulse during the early analysis portion

as

Analyzer A and

START to select the number of additional

5.

Line

Program

Impulse.

of

START has been previously impulsed.

IMPULSE

B)

of the first repeat line, and is

This impulse is available during

the

print

cycle.

It

is,

however, inactive

During

hubs emit, and the

hubs are inactive.

6.

Line

Program

Selectors.

The'

line program selectors are

of

the information being printed

LINE

from the output track. Each selector has eleven positions; ten
these are grouped near the output track and an eleventh position
of

each selector is near the control section. Each position has a

COMMON
COMMON

five pickup hubs
the

TRANSFERRED

until the line is printed and drop out as the

hub, a
hub

COMMON

NORMAL

is

connected to the

is

hub

hub above it.

hub, and

five

TRANSFERRED

NORMAL

hub

until one

impulsed, usually from the MLP I hubs. Then

is connected to the correspondingly numbered

The

selectors remain transferred

print

to the home position.

7.

Skip-To. These hubs are impulsed from Analyzer Exits

or

from 305 control impulses wired through communication

channels to cause the tractor to feed the paper in the

as

the corresponding hole in the control tape.

In

the carriage control
tape, channels 1-6 stop the corresponding skips. Channel
the control tape causes an impulse to be emitted from the

(Overflow
first printing line on

hub)

that may be wired to advance the paper to the

the

following form.

An

OUT

of

the

The

in

IN

MLP

MLP

lines.

if

an MLP

PROGRAM

of

hubs. The

of

the

head returns

printer

to

12

in

OF

14

IBM RAMAC 305

:

n-I

I-I

I I I I I I 1 1 1 1

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24

25

26

27

28

29

30

31

32 33

34

35 36

37 38 39

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401

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Figure 2. 370 Printer Control Panel

REFERENCE

SUMMARY

15

;c

»-

~

»-

()

w

o

U'1

,-

ANALYSIS

·1-

(])

"0

2

32

...

Carriage

Always Moves

this

far

CONTROL

PANEL

HUBS

>.

0

U

Z

0 2

4

6

8

10

12 14

16 18

20

Analyzer

Control

Impulse

(A)

A

*

-.

Analyzer

Control Impulse

(B)

A

*

....

Analyzer

Control

Impulse

(C)

A

*

..

-

Analyzer

Control

Impulse

(D)

A

*

•••

Pilot

Selector

Couple

Exit

A

:-

(Special

Feature)

MLP

Repeat

Out

Impulse

(

Special

Feature)

A 6

••

Analyzer

Exits

(A & B)

A 1

••

Analyzer

Exits ( C & D ) A

1

••

Line Program Impulse

A

2

1-.

Line

Space

1

A

I-~

Line

Space

2

A 3

I-

I-

Line

Space

3 A 4

I-~

I-

1-.

MLP

Impulse

A 2

I-~

OF

(overflow)

A

5

I-

..

..

r--

..

Print

Control

Exits

B

..

I--~ I--

Print Position Exits B

*

~

370

PRINTER

CONTROL

PANEL

ENTRIES

CONTROL PANEl

HUBS

Communication

Distributors
Line

End

Line Prog.

Sel.

Pickup

Line Prog.

Sel.

(Transfer)

Line Space

Common

Hubs
NX-Eliminate
Output

Track

Print

Space

Print

Start

Print

Stop

Selector

Pickup

Selector

(Transfer)
Skip-To
Symbols
X-Eliminate
Zero Supp.

Start

Zero Supp. Stop

ENTRY

DESCRIPTION

Accepts

whatever

is

entered.

Accepts

any

low level impulse.

Wire

from

any

print

control

exit.

Accepts

any

low level impulse.

Transfer

immediately;

drop

out

with

line end.

Will

accept

only

line space

1,2,

or

3.

Wire

from

any

print

control

exit.

Wire

from

ACI

or

print

position exit only.

Wire

from

any

print

position exit.

Wire

from

any

print

control

exit.

Wire

from

any

print

control

exit.
Accepts any low level impulse.
Transfer

immediately;

drop

out

with

line end.

Accepts

any

low level impulse.

Wire

from

any

print

control

exit.
Wire

from

any

print

control

exit.
Wire

from

any

print

control

exit.
Wire

from

any

print

control

exit.

22

r--

..

..

I--

P

RI

N T

•

32-Carriage

Under

Control

of

Print

Stop---{

24

26

28

30

0

I--

•

.:-

r--

-'

r--

•

r--

..

r--

-'

t--

..

I--

•

t--

..

r--

12

t--

13

t--

14

r-l

•

• • •

• •

I--

.-i

r--

..

I--

•

r--

..

t--

..

r-

•

r--

•

t--

•

t--

•

t--

•

t--

15t-

•

~

•

•

Machine Cycle Code:

A.

Emit

only

during

analysis

portion

of

cycle.

B.

Impulses

continue

for

all 80

print

positions.

Notes:

1.

Emit

if

Analyzer

Control

Impulse

hub

has been wired

to

an

output

track

position. (Blank emits

on

each

print

cycle except

MLP

2,

3,

and 4

if

ACI

is

not

wired

to

output.)

2.

If

MLP

START

has been impulsed,

LINE

PROGRAM

IMPULSE

is

inactive.

3.

To

select double spacing, selectors

must

be

transferred

in time

to

accept

the first impulse.

4.

To

select triple spacing, selectors

must

be

transferred

in time to

accept

the first impulse.

5.

Under

control

of

the

carriage.

High

Level Impulses.

6.

Emits on first repeat line.

Figure 3.. 370 Printer

Timing

Chart

8.

OF

of

the carriage control tape, during the analysis portion of a

cycle, it causes an impulse to be emitted from these hubs.

(Overflow).

When

a hole is sensed in the

12

channel

print

The
impulse may be wired to cause the paper to be skipped to the
first line of the following form by impulsing one of the skip-to
hubs, and placing a hole in the control tape in that channel to
stop the tape at the

proper

place.

The

OF

impulse may also be
wired through communication channels to the processing control
panel, where it may pick
of the program to determine
Then

steps in the program can decide whether to complete the

form or start the following form.

to the next form,

the

processing

up

a selector that

if

unit

is

tested

in

the course

the overflow condition exists.

If

the

printing

is

to overflow

can, by control codes wired

through communication channels, control the overflow skip.

9. Line Space.

To

allow variable spacing, the space control

impulses are wired on the control panel. A jackplug may be

inserted between one

above it to cause single, double,

of

the numbered hubs and the space

or

triple spacing. Alternatively,

hub

the space control wiring may be selected to allow variable spacing.

10.

Communication.
ingly numbered hubs on the
signal communication between the processing

11.

Print

Start. These hubs are impulsed from
Exits to start printing at any desired column as the
moves across the paper.
will continue to

Print Stop.
times
format control.

In

in

this way, printing can be turned on and off several

the course of printing a line to give added flexibility in

The

each field to be printed

12.

Print

Stop. These hubs are impulsed from the

trol Exit of the

These hubs connect to the correspond-

305 Process Control Panel to allow

unit

and the printer.

Print

print

Once the printing is started, the machine

print

until printing is turned off by impulsing

Print

Control Exit for the first column of

is

wired to these hubs.

Print

first position not to be printed, to turn

Control

head

Con-

printing

off, if other information is to be printed later on the same line.

Impulsing these hubs causes printing to be suppressed until

Print

Start is impulsed.

13.

Line

End. These hubs are wired from the

Print

Control

Exit of the position after the last position to be printed on a

line to cause the printing to stop and the

the home position.

This

allows the length of the

print

head to return to

printing

line to

be controlled. Variable printing lengths are possible by wiring

Line End through selectors.

14.

Zero

Print

Control Exit of the high-order position of a field to

eliminate the

When

printing

these hubs have been impulsed, the

positions containing zeros until a significant digit

Suppression

encountered and

printed;

Start. These hubs are wired from the

of zeros to the left of significant digits.

print

unit

spaces over

(1-9)

then all zeros to the

right

of the sig-

nificant digit are printed.

Zero

15.

Suppression

Stop. Once Zero Suppression Start

has been impulsed, zero suppression will continue until a sig-

nificant digit

ended

(not

by

zero) is encountered and printed

impulsing these hubs from the

Print

or

until

it

Control Exit

of the first position not to be suppressed.

16.

X-Eliminate.

Negative numbers are recorded on the

output
track (as on all other processing tracks) by an X-bit over the
low-order position.

output track at 12N.

For

example, the amount 125 stands on the

The

X-eliminate and NX-eliminate hubs
allow the printer to read the X-punch or the digit punch from an
output

track position to separate the signed character into its sign

and digit components. These hubs are impulsed from

Print

Con­trol Exits to cause only the digit portion of the character being
set up to be printed.

17.

NX-Eliminate.

Control Exits to allow only the sign portion

be printed

(item

These hubs are impulsed from the

16).

of

a character to

Print

18.

Ll

plugged, if a

(Delta).

Ll

in the left-hand margin opposite the line in error and the

When

print

the two hubs labeled

setup error occurs, the machine will

Ll

STOP

machine will stop.

When

machine will

the two hubs labeled

print a Ll,

Ll

but will

N.

STOP

not

stop when a

are jackplugged, the

error occurs.

If

neither

Ll

STOP

nor

Ll

N.

STOP

stop,

but a Ll

19.

will not be printed if a

INTLK

(Interlock).

before any printing operation can be initiated.

not operate

if

these hubs are left unplugged.

are plugged, the machine will

print

setup error occurs.

These hubs must be jackplugged

The

20. Symbols. These hubs are wired from the

Exits to cause the corresponding symbol to be printed. These

symbols may be selected through the line program selectors.

21. Co-selectors. These selectors may be used to supplement
the line program selectors. Each co-selector has
each position has a

COMMON, a NORMAL

Normally, a connection exists between the

NORMAL

nection
and the
ors may be picked

hub,

but

is

broken and a connection is made between the

TRANSFERRED

up

when the

PICKUP

hub is impulsed, this con-

hub

in the same vertical column. Co-select-

in

the same manner

five

and a

TRANSFERRED
COMMON

as

the line program

selectors, and they remain transferred for the entire

22.

Output

Track.

At

is

read in its entirety,
ing. This selection is made by wiring the
the output track position desired to the
corresponding to the

each printing position, the

but

only one character

printing

position where the character is to

is

selected for print-

hub

corresponding to

Print

print.

23.

Print

put

track

set

print

(item

up

to

print

position ten of the

Track position 10

Position

24.

Print

Space. All
the output track should be wired to these hubs.
the checking circuits that the

Exits. These hubs are wired from the out-

22)

to cause the corresponding positions to be

information on the output track. For example, to

output

track in

print

is

wired from

print

Print

positions that are not wired from

position 50,

Position Exit 50.

This

printer

is

not to

print
sponding column, and allows the checking circuits to detect any
position that was wired to

Pilot

25.

Selectors. These selectors may be used to control
printer functions based on
through communication channels,

is

IMMEDIATE

PICKUP:

pulsed from Analyzer A,

MLP

I Exits 1-4 (special feature MLP Repeat,
or a program Exit.
Print

is

on the process control panel, and normally should not be
used to impulse 370 functions directly - these functions should
be controlled by the

DELAY

PICKUP:

Accepts the same impulses
to transfer the selector for the following line,
Exception: the couple exit of another
program exit

is

used to impulse delay pickup, the selector trans-

print

and failed to set

up

Program Exit impulses received

or

from 370 impulses.

Selectors transfer immediately when im-

B, C,

or

D Exits, Space, Overflow,

MLP

(The

program exit used must also impulse

pilot

selector.)

as

immediate pickup

or

pilot

selector.

fers immediately on the first line after the program exit.

COUPLE

mediate pickup

Drop-out:

line,

may be dropped out manually

key. Depressing the

or

in the case

EXIT:

When

hub

The

the delay pickup hub is used, the im-

becomes a Couple Exit.

selectors normally drop out

of

MLP,

at

Printer Check Reset key does

at

the end of

by

the

depressing the Printer Reset

the end of the

last

MLP

the pilot selectors; they remain transferred and allow the selectors
to provide the same control for all

Print

Repeat lines.

are jack-

print

print

setup

printer will

Print

Control

positions, and

hub.

and the

COMMON

print

line.

output

track

Position Exit

Output

indicates to

in the corre-

correctly.

I exits

5-8),

lines,

if

MLP.

When

line. They

not

drop ·out

a

a

REFERENCE

SUMMARY

17

Punch

Control Panel (Figure

1.

Output

Track.

These hubs emit the IBM codes

4)

of

the in-

formation on the output track. These exits may be wired to the
punch magnets to cause punching. This allows any
output

track positions to be punched into any of the 80 card

of

the 100

columns.

2.

Digit

series of impulses which are timed for punching the digits

Selector.

through 9.

If

digit selector becomes a digit emitter with a

at the

12

output

hub, an

track position is wired to the C hub, whatever digit or
character appears at that output track position will be made
able in

IBM

code at the numbered hubs of the digit selector.

3.

Sign Conversion.

by

a combination of X and a-bits. Also, sign control on negative
fields is maintained by carrying an
tion.

If

the low-order position of a field is zero and the field is

negative, a 12-hole would be punched

directly to a punch magnet.

The

or hub at the top of the panel emits a

the or

hub

is wired to the C hub beneath it, the

11

impulse available at the

Within

The

12

12

impulse available

11

hub, etc.

If

an

avail-

the system, the

12

holes are coded

X-bit over the low-order posi-

if

this position were wired

sign conversion hubs are provided

so that the 12-impulse available from the output track may be

converted to the

In

use, the low-order position
be negative is wired from the output track to an
the corresponding
emitted from this position of the output track, it

X/O.

Any other negative number is overpunched with

x/a

code desired for these positions.

of

any numerical field that may

OUT

hub to the punch magnet.

IN

hub and from

If

a 12-code is

is

punched

an

as

X.

Positive numbers pass through without conversion.

Column

4.

matically controlled to transfer between X and a time

is

punched.

Splits.

This

This

allows the

is

a la-position selector that

as

12

and X zones to be removed from

is

auto-

the card

columns and punched into other columns.

5. Co-selectors. As a special device,

5-position Co-selectors may be installed to allow changes in

ing format for different types of cards. Each selector is a

up

to

five

groups of four

punch-

five-

position selector with two common pickup hubs. Each position has

a C (common), N (normal) and a T (transferred) hub.

The

common hub is connected to the normal hub until the selector is

picked up

by

impulsing the pickup hub.

Then

the common

connected to the transferred hub.

When

the pickup is impulsed, the selector transfers immedi­ately, and will remain transferred for the remainder of the punch
cycle.

The

Co-selector pickup hubs may be impulsed from any digit

impulse, Half-After-Zero,

the Punch Repeat

(0-5),

OUT

Pilot Selector

hubs; however, they should riot be im-

COUPLE,

or from

pulsed by a 305 Program Exit wired through a Communication

Channel. Co-selectors must be used

DET

CONTROL

wiring when controlling

ferent card formats, as well

OFF

switches.

Punch

6.

Magnets. These hubs are entries to the 80 punch

magnets that punch the correspondingly numbered columns

as

the DPBC

if

it

is necessary to select BC

DPBC

checking for dif-

STOP,

OFFSET,

and BC

of

the

card. These magnets are wired from the output track positions

that are to be punched.

7.

Punch

it

passes a set

tion that has been punched so that

Brushes.

On

of

the punch cycle after a card is punched,

80 reading brushes that read back the informa-

it

may be given the double-

punch blank-column check. These hubs are the exits for the read-

ing on this cycle.

The

information may also be gang-punched back

into the following card.

8.

DP

& BC

Det

Entry. These hubs may be wired from the
punch brushes to check individual columns for double punching
or

lack of punching. This is particularly valuable

in

numerical

fields, where every posltlOn must have one and only one hole.

If

the machine detects multiple punches
column wired,
do so.

The

it

will stop the machine

DPBC light on the punch

or

lack

of

if

the control

unit

is turned on to indicate

the reason the machine stopped.

9.

BC

Det

Entry

or

GP

Exit.

If

wired into

&

BC

DET

DP & BC

ENTRY

DET

ENTRY,

emerges from these hubs, from which it may be

the column being checked

the first impulse to enter the

wired to a punch magnet for gangpunching.

If

a column in which double punching is permissible
checked for blanks, these hubs are used
pulse to enter these hubs emerges from the

as

an entry.

DP & BC

hubs.

10. BC

Det

be done, the Blank Column

Control.

To

wired.

ENTRY

check a field for blank columns, wire the field to the

or

EXIT

of the

If

no checking for blank columns

OFF

switch (item 12) must be

DP & BC

If

anyone

field is to be checked,
wire it to the left-hand entry positions and, in the blank-column
detection control row, wire from the right-hand column
field to the last position in the row. Several fields can be entered

as one field for checking purposes.

11.

DPBC

Stop.

When

chine will stop

if

these hubs are jackplugged, the ma-

a DPBC error occurs. This switch may

selected if co-selectors are used.

12. BC

Off

(Blank

Column

Off).

These hubs must be jack­plugged to turn the blank column detection feature off when no
punched columns are to be checked for blank columns.

13.

Offset.

When

is installed, the DPBC
error card rather than stop.
types of cards

the Offset Stacking Feature (special device)

Offset switch may be plugged to offset an

It

so

that

they may be easily distinguished from the

is also possible to offset different

main group of cards when removed from the stacker. This switch

may be selected; however, co-selectors must be used.

14.

INT

(Interlock).

Whenever the punch is to be used to

punch output cards for the processing unit, this control panel

switch must be jackplugged.

15.

is

Gangpunch.
plugged, the 323 Punch is removed from the control of the
processing

unit

When

this control panel switch is jack-

and may be used

as

an independent gangpunch.

16. Communication. These hubs are connected to the

spondingly numbered hubs labeled

PCH

on the process control

pane1.

Punch

IN

17.
(P

or

Repeat.

D),

When

an impulse is wired to Punch Repeat

one additional card will automatically be punched

from the same output track data.

If

selectors are used, two cards

obtained from the single

output

with

different formats can be

track.

Without

identical cards are punched.

When

Punch Control Panel will emit just

Punch Repeat has been impulsed, the

second card.

selectors

This

or

impulse may be wired to the D pickup

to co-selector pickups to control the punching for

prior

OUT

to punching time of the

the second card.

A program exit wired through a communication channel for

the purpose of impulsing punch repeat must be wired to the

(program exit) pickup. Also, the program exit that is wired to

punch repeat must be the same program exit that

PUNCH

on the Process Control Panel.

Digits or. couple exits used to impulse punch repeat must be

(digit)

directed to the D
case of the

impulsed, the

P pickup when the D pickup

OUT

pickup for correct operation. As in the

of

hub will emit just

punch repeat has been

prior

to punching time of

the second card.

a hole in any

is

wired

to

is

DP

is

to

first im-

ENTRY

is

of

the

be

to

The

DET

be

corre-

selectors, two

hub on the

of

pilot

is

wired to

P

18

IBM RAMAC 305

o 5 10

1111111111111111111111

40

5 6 7 8 9 10 II

45

12 13

14

15 16

17

18 19

20

21

15

50

55

22

OUTPUT

60

1111111111111111111111

Y I I I I Y I 1 I I Y I I I I

9f

I

23

24

25 26

27

28

29

30

31

32

33

34

35

36

37

fY-ll-1

1 I 1 I I I I I 1 I I 1 I I I

-

SIGN

o

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-1

CONVERSION

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0 0 0 0 0

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38

39

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41

42

43

44

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Figure

4.

323 Punch Control Panel

00000000

65

00000000

65

AC

AD

AE

AF

AG

AH

AJ

AK

70

70

o

75

o 0

75

o 0

o 0

80

More than one additional card can be punched

Punch Repeat

IN

on successive punch cycles.

tional punch cycles can be controlled by the use of

Punch Repeat will maintain its

restart procedures.

18.

Half-After-Zero

zero time

but

before one time.

(0.5).

so that only the digits 1-9 are punched,
and numerical punching

wired for

19.

Pilot

DPBC

Selectors.

tors may be installed

If

a program exit

of

detection.

Two

as

a special feature.

is

wired through a communication channel
for the purpose of impulsing a pilot selector, the program exit
must

be wired to the P

EXIT

result if a program exit is wired to any other selector pickup.
When

the P

EXIT

pickup

is
immediately and will remain transferred for the duration
associated punch

P

EXIT

pickup must be the same program exit that

PUNCH

on the Process Control Panel.

cycle.

The

by

The

proper

status during error

This

hub

It

may be used to transfer selectors

emits

or

to separate the zone

impulsing

number of addi-

pilot

selectors.

an

impulse after

alphabetic fields so that they can be

groups of

five

2-position pilot selec-

pickup. Improper operation will

impulsed, the selector will transfer

of

program exit that

is

wired to the

is

wired to

the

It

is

possible to impulse the P

pulse; however, if an

output

EXIT

pickup from a digit im-

error should occur, the selector will
remain transferred throughout a run-out and run-in procedure.
On

a run-out and run-in procedure the last punched card is

repunched on the run-in, and because the selector

would

be trans­ferred during the repunching of the last punched card, operations
such as split column control would not function properly.

The

DELAY pickup may be wired from any digit impulse,

COUPLE,

pulsed
nel.

or

from the Punch Repeat

by

a program exit wired through a communication chan-

When

the DELAY pickup

OUT

hub.

It

is

impulsed, the selector will trans-

cannot be im-

fer one punch cycle later, and will remain transferred for one

cycle.

In

the event of an

output

error, selector control will be

automatically maintained.

Associated

selector is transferred by impulsing the P

gram exit, the
time for that card.

DELAY

prior

If

with

each

pilot

selector is a

COUPLE

pickup, the

hub will emit just

If

a selector is picked

COUPLE

exit will emit one cycle later just

to punching time.

it

is

desirable to expand the number

COUPLE

EXIT

pickup from a pro­prior

up

by impulsing the

of

available positions

REFERENCE

hub.

If

a

to punching

SUMMARY

pilot

19

LOCATION

X,

1-40;

AA,I-4O

AH,43

W,

1-40;

Z,I-4O

A,

41-44

AG,43

AK,42

AJ,41-42

AK,43
AJ

, 43

A-D,I-4O; E-F, 1-20

AD,31-40

AC-AD,

41-44

T-U,

1-40

AH,

41-42

Co-Selector ( Transferred)

Selector

Repeat

Common

PU ( Delay)
PU ( Prog

IN ( Digit)

IN ( Prog

Digit

Pilot Selector

Pilot Selector

Pilot Selector ( Trans)

Punch

Punch Repeat

Exit)

Exit)

LOCATION

X,

1-40;

AA,I-40

W,

1-40;

Z,I-4O

AH,44
H,

31-40

G,

31-40

AC-AD,41-44

Q-Z,

41-44

S,

41-44

V,

1-40;

Y, 1-40

AG,44

AK,41

AK,44
AJ,44

AS,

31-40

AC

, 31-40

N-P,

1-40

AF-AG,42

AF-AG,41

11.0

0.0

1.0

2.0

3.0

4.0

5.0

6.0

7.0

8.0

Figure 5. 323 Punch

20

IBM RAMAC

30£;

Timing

Chart

of a pilot selector, the

pickup.

The

co-selector will then function in the exact manner

as the pilot selector.

COUPLE

COUPLE

exit may be wired to a co-selector

may also be wired to the

DELAY

pickup of another pilot selector to cause it to transfer one cycle

later.

Typewriter Control Panel (Figure

1.

Column

Control

Exits.

When

6)

the typewriter is being used
for inquiries or for printing an auxiliary document, these hubs
seqeuentially emit impulses that coincide
corresponding position

of

the typewriter Q track. These impulses

with

the reading of the

control the format of the information being printed.

The

first Q track position to be read

Column Control Entry (item

is

13).

controlled by wiring the

Subsequently, the machine
reads succeeding positions until the control is transferred else­where.

This

arrangement allows the typewriter to type fields from

the typewriter track in any order.

If

at

any time the program

turned on, the column control exits stop emitting,

sequential position

is
is impulsed to transfer control to another position.
Program

ON

hubs are impulsed, column control
until Column Control
Delay

is

from the

impulsed, on the following cycle an impulse

CCD

hub, and then column control

unit

or the column control delay are

but

the same

held, unless the Column Control Entry

When

the

turned off

is

emitted

on

again

ON

is

impulsed.

When

Column Control

is

is

turned

automatically.

2.

Program
sequentially emit impulses when the typewriter
inquiries

Exits.

When

Program

or

for printing an auxiliary document. These impulses

On

is impulsed, these hubs

is

being used for

are used for typewriter control and to type constants, legends and
special characters
is

turned off
advances through steps
first turned on after the final dropout
Program Exit Ao will emit, followed by
Bl,

B2, etc.

by impulsing Program Entries (item

3.

Digit

not

on the typewriter track.

by

impulsing Column Control On, the program

0-4 in levels A-E.

The

program impulses may be started

Until

When

of

the program is

the previous operation,

AI,

A2, A3, A4,

at

12).

Selector.

It

is

sometimes desirable to know the con-

the program

another

point

BO,

tents of a certain typewriter track position so that format control
may be altered on the basis of the character coding.
PU

hub is impulsed from a Column Control

in

that position is analyzed and emitted

hubs labelled 12-9.

While

this

is

in

IBM code from the

taking place, the

EXIT,

When

the

the character

printing

the character is suppressed.

4.

CCD

Delay

is

impulsed, the

used for spacing

(Column

Control

or

other functions. Column control

Delay).

CCD

hubs emit an impulse that may be

When

Column Control

is

suspended
for the cycle on which these hubs emit. After one cycle, the
column control resumes from the step after the one on which the
control was impulsed (item

5.

Column

(item

either the X or

Split

24),

on the next cycle column control

NX-hub

(X-NX).

21).
When

will emit.

Column Split

is

The

suspended and

X-hub

is

impulsed

emits if the

character being analyzed by the column split device contained an

X-bit.

If

no X-bit was present, the

"0"

TR

(Zero

6.

Transfer).

ture is turned on by impulsing Zero Sup

read from the typewriter track

NX-hub

emits.

Whenever the zero transfer fea-

On,

(Item

22),

is

not printed,

but

a zero

an impulse is

emitted from these hubs. This impulse may be wired to Space

(Item

20) to maintain vertical column alignment.

7.

100

(Type

100).

Impulsing these hubs causes all 100 char-

acters to be typed from the typewriter track, in position sequence,

without format control.

8.

Format.

These hubs emit control impulses

when
sponding format key is depressed on the keyboard.
from these hubs may be used to set selectors to establish format

control for three different types

of

inquiries and to start the type-

writer control panel program.

9.

Type.

When

the

TYPE

control panel, the typewriter

be used to control format for lines typed

hubs are impulsed on the process

TYPE

hubs emit an impulse that may

out

under stored pro-

gram control and to start the typewriter control panel program.

10. Selectors.

Ten

2-position selectors

are.

provided to facilitate
format control. Normally a connection exists between each
and the N
this connection is broken and the C

above it.

hub

above it.

This

connection remains until the

When

an impulse is wired to the

hub

is connected to the T

DO

(dropout)

impulsed.

11.

Distributors.

Impulses that are used to initiate several
functions are wired through distributors that serve the same
function
pulse wired into the
associated

hubs,

from the

as

or

from an

OUT

split wires

OUT

hubs,

OUT

but

prevent possible back circuits. An im-

IN

hub

of a distributor is available

but

impulses cannot travel between

hub

to the

IN

hub. Any impulse except

hub of another distributor may be wired through

a distributor.

Program

12.
of a sequence of program impulses, one
hub are impulsed in the same manner that the

are impulsed on the process control panel.

turned on automatically

Entry

(Also

item

2).

To

LEVEL

by

impulsing Program Entry

establish the beginning

hub

PROGRAM

The

program

impulsing Program On.

13.

Column
sequence of column control (item
hub are impulsed in the same manner that the

Control

Entry.

To

establish the beginning of a

1),

one

TENS

PROGRAM

are impulsed on the process control panel. Column control is

turned on automatically by impulsing Column Control Entry
without impulsing Column Control

NOTE:

Column Control Entry must not be impulsed at the

On.

same time as Column Split.

14.

Type

Only.

When

exits

or

CCD, the corresponding characters are typed.

15.

Clear. Impulsing these hubs causes the typing to stop and

these hubs are impulsed from program

the carriage to return.

16.

of

Column

the typewriter to column control after program control has been

used,

if

Control

On.

These hubs are impulsed to restore

it is desired to restart from the track position after the
last position used previously. Column control is turned on auto­matically if a column control entry is made.

Program control

turned off.

17.

Program

writer

under program control. Column control is turned off. Pro-

gram control is turned

On.

These hubs are impulsed to place the type-

on

automatically

when

a program entry

is made.

18.

Carriage

Return.

Impulsing these hubs causes the type-

writer carriage to return to the left margin.

19.

Tabulate.

Impulsing these hubs causes the carriage to

tabulate to the next tab stop.

20. Space. Impulsing these hubs causes the typewriter to space

one space.

21.

Column

Control

Delay

(Item

4).

When
impulsed, column control is suspended for one cycle, during
which an impulse is emitted from the

CCD

hub

(item
control resumes control immediately after this cycle, continuing
from the column after the column that was wired to impulse

the delay.

the corre-

The

impulses

chub

PU

hub
hub

hub

at

the

OUT

that

and one

STEP

ENTRIES

unit

without

and one

UNITS

ENTRIES

these hubs are

4).

Column

is

is

is

REFERENCE

SUMMARY

21

A

B

C

D

H.

2

BUS

4

COL

CTRL

~

: : :

~

0 0 M 0 2 0

15

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00

40

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45

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r-~----------~--~----SELECTORS----~~----------_~-,

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19

20

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9

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AA

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AF

AG

AH

AJ

AK

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o

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----------OUT---------

o 0 0

21

o 0 0 0

~

TYt

B M X

o 0 0

o 0 Z

o 0 0

EPa

o 0 0 0

F

o

G

o

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o

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0 0

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o 0

4

5

o

6

o

8

o

o

9

o

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o 0 0 0

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o 0 0 0

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o 0

o

BUS

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0

000

000

000

0

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0

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IN

0

Figure 6.

22.

Zero

impulsed,

be typed,

(item
function.
impulsed (item 23)
from the track. This arrangement allows the zeros in the

order position of fields to be suppressed. Zero Suppression

impulsed one position before

23.
the zero suppression feature off when
to the left

on by previous wiring.

24.
split device to analyze the character being typed for the presence

22

Suppression

if

a zero is read from the typewriter track

but

an impulse will be emitted from the 0

6)

which may be wired to cause spacing

The

printing

Zero

Suppression Off. These hubs are impulsed to turn

of

significant digits, and the feature has been turned

Column

IBM RAMAC 305

Split. Impulsing these hubs causes the column

On

(Also

item

of

zeros is resumed when the

or

when

a character other than zero

it

is to become active.

it

Zero Suppression

6).

When

is desired to

Off

occurs immediately.

this

it

will

TR

or

some other

OFF

print

380

Console Control Panel

or

hub

hub

is

high-

On

zeros

is

not

hubs

is

read

is

absence of an X-lSit.
matically suspended and the Column Split X or
emit.
Exit, the corresponding
numerical digit. Column
time

25.

wrl'ter

26.

writer to type through the red portion

27. Communication. These hubs connect to the correspond-

ingly numhered hubs labeled
allow signal communication between the processing
the console.

On

the next cycle, column control

When

Column Split

as

Column Control Entry.

Ribbon

Ribbon

Shift

to type through the black portion

Shift

is

impulsed from a Column Control

Q track character will type only

Split must not be impulsed at the same

Black. Impulsing this hub causes the type-

Red. Impulsing this hub causes the type-

TW

on the 305 Process Panel to

NX-hub

of

a two-color ribbon.

of

a two-color ribbon.

is

unit

auto-

will

as

and

a

ALL

CONTROL

of

60 load units

(1)

(2)

PANEL

EXITS may be loaded to a maximum rating

with

the following exceptions:

305 - Distributors - 30 max.

- Inquiry

-

370

- Distributors -

-

Out

- 30 max.

Start - 30 max.

30

MLP

I Exit - 30 max.

max.

Load Rating Chart

(3)

380 - Distributors - 30 max.

To

insure

that

electrical limits are
can be made to the Load Rating Table shown in
the

individual load rating for each function associated
exit to be sure the maximum allowable load is
Also, be sure that each distributor exit is

not

being exceeded, reference

not

overloaded.

Figure

not

7.

Add

with

an

exceeded.

CONTROL

Accumulator

ENTRY

- 305 -

PANEL

HUB

Drop

Out
Accumulator Overflow
Accumulator Sign
Blank Transmission

Char Sel

Alpha

Char Sel Numeric
Comm Channel
Comm Channel
Compare

IN

IN

IN

IN

IN

(Print)

(Punch)

Cycle Delay
Distributors

* DPIS DO

* DPIS

PU

*

Dual

Access Sel

*

Dual

Access 0 and

Feed Card 3

Field Compare
Hundreds

Inquire

Last Card

IN

Program Entry

IN

IN

Print
Program Advance

* Program Exit Split DO 3
* Program Exit Split

Punch

Record Advance
Reset
Reset Stop
Selector

PU

Selector DO
Skip-To-Record
Stop
Tens Program Entry
Type
Units Program Entry

PU

IN

* Special Features

LOAD

RATING

3

IN

0+
0+
0+
0+
0+
0+
0+
0+

6

0+

6
6

0+
0+

0+
1
5
0+
5
2

3

3
5
3
3
3

3

6

1
5
2

CONTROL

BC
BC

ENTRY

-

Det

Det

PANEL

HUB

323-

Control

Entry

RATING

Column Splits

* Co-selector

Digit
DP

*

Pilot

*

Pilot
Punch
Punch Repeat
Sign Conversion

CONTROL

ENTRY

--

Selectors

& BC

Selectors
Selectors

Magnets

PANEL

HUB

370

PU

Det

-

Entry

(D)

(p)

IN

(P&D)

IN

RATING

Comm Channels
Co-selector

PU

Distributors

Line End 8

Lifle Prog. Sel.

PU

Line Space

*

MLP

RPT
MLP
MLP
MLP
MLP

NX

*

Pilot

*

Pilot

Output

IN

Start i
Start 2
Start 3
Start 4 6
Eliminate

Selector

Selector

PU

PU

(D)

(I)

Track

Units and Tens Entry.

LOAD

2

2 X Eliminate

0+
2
0+
3
2
3

10

2

2

Print

Space

Print

Start

Print

Stop 12

Skip to

Hubs

Symbols

Zero Supp Start 3
Zero Supp Stop 3

CONTROL

ENTRY

-

PANEL

HUB

380-

LOAD

RATING

Carriage Return
Clear
Col Ctrl Delay

LOAD

Col Ctrl Entry
Col Ctrl

On

Column Split

Comm Channel

0+
2

0+

3
8

3

2
3 Space

4

2

2

3

1

Digit

Selector

PU

Distributors
Program Entry
Program

On

Ribbon Shift B

Ribbon Shift R

Selector DO 3
Selector

PU

Tab

100

Type
Type Only
Zero Suppress
Zero Suppress

Off

On

NOTE:

When

a load rating

determined by

the

of

0+ is shown, the load is

final use

of

the function.
example, assume a panel impulse is wired to
cumulator overflow
Program Advance,

condition is

0+2=2.

IN,

and

For

overflow

YES is

The

YES,

NO

wired

load

rating

0+5+2+1=8.

is wired to

to type and

for the

2

3

12

2

2
2
2

2

2

4

0+
2
0+
2
2
2
2

3
8

2

2

4

2

3

For

ac-

NO

Figure

7.

Load Rating Chart

REFERENCE

SUMMARY

23

lldIDdktr

International
Data

®

Business

Processing

Machines Corporation

Division,

112

East Post Road,

White

Plains,

New

York

Printed

in U.S.A.

G26-3540-0