REX
1377 Display Station
Operation and Service Manual
1377.20-01
Publication Number 1377.20-01
March 1976 edition
The information in this publication is subject
to
periodic revisions and
to
updates by Publications Bulletins. A bulletin is identified
as
Publication
Number
1377.20-01
XX,
where "XX" equals
"01"
for
the first bulletin
released. ' ,
To request copies
of
this publication
or
any bulletin, send a Supplies
Requisition (form number 7020) using the publication number to: Memorex
Corporation, Marketing Distribution Center, San Tomas at Central Expressway, Santa Clara, California 95052.
A readers' comments form is provided at the back
of
this publication.
If
the
form has been removed, please send comments to Memorex Corporation,
Department 6940, MIS 14-07, San Tomas at Central Expressway, Santa
Clara, California 95052.
©1976
MEMOREX CORPORATION
PREFACE
This manual provides information about the operation
of
and service requirements
for
the Memorex 1377 Display Station. The Introduction, Section 1, lists the advantages
of
the 1377 Display Station over other cathode-ray tube display stations. A description
of
the 1377 display, keyboards, and optional selector
light
pen operation
is
provided in
Section
2.
Sections 3, 4, and 5 comprise installation procedures, maintenance instructions, and
programming notes, respectively.
Because the Memorex 1377 is designed to interface specifically with the IBM 3271,
3272,
or
3791
Control Unit, the reader should refer to the following IBM publications
for
system information:
• An Introduction
to
the IBM 3270 Information Display System, GA27-2739
• IBM 3270 Information Display System Component Description, GA27-2749
• Introduction
to
Programming the IBM 3270, GC27-6999
• A Guide to Using the Test Request Feature on IBM 3270 Information Display
Systems, GA27 -2774
• An Introduction to the IBM 3790 Communication System, GA27-2767
1377.20-01-3/76
iii
TABLE OF CONTENTS
Section
Page
1 INTRODUCTION
...................................................
1-1
2 OPERATOR'S
GUiDE
...............................................
2-1
2.1
1377 DISPLAY
...................................................
2-1
2.2 KEYBOARD OPERATION
.........................................
2-2
2.3 1377 SELECTOR
LIGHT
PEN
....................................
2-13
3 INSTALLATION
....................................................
3-1
3.1
SPECIFICATIONS
................................................
3-1
3.2 CABLE REQUIREMENTS
.........................................
3-3
3.3 PROCEDURE
....................................................
3-3
4 MAINTENANCE
....................................................
4-1
4.1
DISASSEMBLY/ASSEMBLY
.......................................
4-1
4.1.1
Monitor
Disassembly
...........................................
4-1
4.1.2 Keyboard Disassembly
..........................................
4-7
4.2 MONITOR
ALIGNMENT
.........................................
4-10
4.2.1
Voltage Levels
.................................................
4-11
4.2.2 Horizontal Size
................................................
4-13
4.2.3 Horizontal Frequency
.............................•............
4-14
4.2.4 Vertical Size
...................................................
4-15
4.2.5 Vertical Linearity
..............................................
4-16
4.2.6 Master Brightness
.............................................
4-17
4.2.7 Centering
.....................................................
4-18
4.2.8 Tilted Raster
..................................................
4-19
4.2.9 Focus
.........................................................
4-20
4.3 TROUBLESHOOTING
..............................
. . . . . . . . . . .
..
4-20
5 PROGRAMMING NOTES
...........................................
5-1
1377
.20-01-3/76
iv
SECTION
1
INTRODUCTION
The Memorex 1377 Display Station, shown in Figure
1-1
, consists
of a high-
performance cathode-ray tube (CRT), a
typewriter
or
operator
console keyboard, and
an
optional
selector
light
pen. These Display Stations are used in local
or
remote
clusters
to
display
alphanumeric
data, and to enter data
into
and retrieve data from
an
IBM System/360
or
System/370 . Figure 1-2 illustrates
compatible
system
con-
figu rations.
FIGURE
1-1. MEMOREX 1377 DISPLAY STATION
1377 .
20-01-3
/76
1-1
-"
I
N
S/360-370
MPLX
CHNL
SLTR
CHNL
BLK
MPLX
CHNL
S/370
BLK
MPLX
CHNL
1270
2701
2703
3704
j~
•
..
1270
AND
1360
ARE
MEMOREX CONTROL UNITS;
OTHERS SHOWN
ARE
IBM CONTROL UNITS.
HALF/FULL DUPLEX COMM
f---~B-I-SY-N-C-:-H-R-O-N-O-U~S----""-
LINE
f-
_______
Fc...;U:..:L:=L-.:D:..:U:..cP..=L.::cEX-'-
___
COMM
--~
SDLC LINE
3271-2*
3271-12'
3791··
·ONE TO
FOUR
DEVICES (STATIONS/PRINTERS)
MAYBE
ATTACHED TO A SINGLE CONTROL UNIT
WITHOUT FEATURES INSTALLED. WITH FEATURES, 5 TO
32
DEVICES MAY
BE
ATTACHED.
··ONE
TO
31
STATIONS MAY
BE
ATTACHED TO A
SINGLE
3791
CONTROL UNIT.
FIGURE 1-2, LOCAL AND REMOTE CLUSTERS OF 1377 DISPLAY STATIONS IN COMPATIBLE SYSTEM CONFIGURATIONS
The Memorex 1377
is
a plug-compatible replacement
for
the IBM 3277-2 Display
Station used in IBM 3270 Information Display Systems. Unique advantages
of
the 1377
are provided by the following
standard features.
• Upper/lower case graphics.
• Keyboard shift lock - Permits full secretarial shift.
• Audible Alarm
for
source
error
detection - Alerts the operator that a
keyboard entry was
not
accepted
or
that the screen
is
full. Additional
utilization
of
the Audible Alarm may be provided
by
the application program.
• Horizontal frequency
of
approximately 19 KHz - Provides quiet operation.
• Non-glare screen - Reduces eye strain.
• Refresh cycle
of
60 Hz - Eliminates eye fatigue caused by noticeable
blinking
of
the display.
• Reverse video
cursor
(dark
print
on
light
background when remainder
of
screen displays
light
print
on a dark background) - Indicates clearly where
the next character typed on the keyboard will appear on the screen.
• Additional line (line 25) - Indicates line and column numbers
of
cursor and
defines status (Le., SYSTEM AVAILABLE, INPUT INHIBITED, and INSERT
MODE).
• Keyboard Numeric Lock - Allows the programmer
to
set up fields that will
accept only numeric entries from the keyboard.
• Tiltable screen - Flexible position adjustment allows the screen
to
be tilted
for
maximum operator convenience
or
unusual operating environments.
• Fewer components resulting in reduced power consumption and increased
reliability.
1377
.20-01-3/76
1-3
2.1
1377 DISPLAY
SECTION 2
OPERATOR'S GUIDE
The
1377
display, shown in Figure 2-1, allows up to 1920 characters
to
be entered
and/or displayed
in
an
area
24
lines by
80
columns. An additional line is provided at
the bottom
of
the screen to display the cursor line and column number position$ and
machine status
as
illustrated
in
Figure 2-1.
The display may
be
unformatted
or
formatted, depending on the application program.
An unformatted display allows entering data in any line except the 25th line, which is
reserved for cursor location and status information. A formatted screen provides
display fields intended
for
certain types
of
information, such
as
customer name, date,
model number, etc.
The keyboard Numeric Lock feature prevents entering any type
of
data except
numeric data (numerals, minus sign, period, and DUP) into certain fields set up by the
application program. If the operator attempts to enter
an
alphabetic character into a
program-controlled numeric field, INPUT INHIBITED appears on the ·screen and the
Audible Alarm sounds from the the station. The computer may also indicate to the
operator erroneous data entry into other display fields, although the alarm and system
status may not indicate the error unless directed
to
do so by the program.
FIGURE 2-1. 1377 DISPLAY
1377
.20-01-3/76
2-1
Some
of
the fields on a formatted screen are protected
by
the program. Any attempt to
enter data in a field that is protected is inhibited. A protected field is generally the title
of
the information to be entered by the operator (Le., MODEL NO.). Data
mayor
may
not
be displayed, depending on the program. In a personnel history,
for
example,
SALARY display and/or modification would probably be inhibited to the operator.
Since the program knows what type
of
information to expect from the fields set up on
a formatted screen, it can process the data much more rapidly than
it
can process data
entered randomly on an unformatted screen.
The Power.
switc/1foroperation
of
the 1377 Display Station is located in
the
.Iower
lefthand corner
of
the display
as
shown in Figure 2-1. The switch is a push.,.pull switch
which provides power to the Display Station when pulled
out
and removes power
when pushed in.
In
addition, the operator can adjust the brightness
of
the display by
turning the switch clockwise
for
a brighter image
or
counterclockwise to dim the
image.
To accommodate a variety
of
viewing angles, the 1377 display may be adjusted to
individual preference. This adjustment is made by turning the knobs located on each
side
of
the display (reference Figure 2-1) in a counterclockwise motion to release the
display, adjusting the
screenas
desired, and turning the knobs in a clockwise motion
to tighten. them, thus securing the desired viewing angle.
As noted
in
the Introduction, the 1377 display has several advantages
for
the operator
that are provided
as
standard features
of
the Display Station. A non-glare screen and a
rapid refresh cycle
(60
Hz) eliminate eye fatigue caused by glare and blinking
of
the
display. Features are also provided
for
quick reference and early
error
detection
purposes. The reverse video cursor (light rectangular area
on
a dark background
as
shown in Figure 2-1) indicates clearly where the next character to be entered will
appear on the screen.
In
addition to this quick reference aid, the 25th line continuously
displays the cursor line number and column number and spells
out
the current status
information
for
the operator.
2.2
KEYBOARD
OPERATION
Two keyboards are available with the Memorex 1377 Display Station: a standard 78key EBCDIC typewriter keyboard (Figure 2-2) and a 78-key EBCDIC operator console
keyboard (Figure 2-3). In addition, six local function keys
(F1
through
F6)
are available
for
future capabilities.
The unshaded keys in Figures 2-2 and 2-3 are those keys which have an automatic
repeat capability
as
long
as
they are pressed down (Le., the SPACE bar). All other keys
must be pressed down once
for
each . keystroke
..
·NOTE
Any character key can automatically repeat itself when the operator
simultaneously presses the SPACE bar and the character to be
repeated. A Space will occupy the first position on the screen,
but
the character will repeat from that point until the operator releases
the keys.
1377.20-01-3/76
FIGURE 2-2. TYPEWRITER KEYBOARD
FIGURE
2-3. OPERATOR CONSOLE KEYBOARD
A Security Key
lock
feature is provided as
an
optional feature
to
prevent unauthorized
operation
of
either keyboard. Although the cursor appears on the screen when this
feature
is
installed, the keyboard is inoperable unless the key is turned in the key lock
where it must remain
for
the duration
of
keyboard operation. The Security Key
lock
is
located on the righthand side
of
the keyboard.
The operation
of
the Audible Alarm feature has been expanded to include these
additional functions:
• Indicates that the operator has attempted
to
enter data while the system is in
the INPUT INHIBITED mode.
• Indicates that the operator has attempted to tag a non-selectable field using
the selector
light
pen.
• Indicates that the operator has attempted to enter non-numerical data into a
program defined numerical field.
Although the status INPUT INHIBITED appears on the screen when a keyboard entry
is
not
accepted, the sounding
of
the alarm alerts the operator to discontinue entry at
the exact
point
where
input
is inhibited should the operator fail
to
see the status
1377.20-01-3/76
2-3
indication appear on the screen. The Audible Alarm also indicates that the cursor is in
the last character position on the screen.
In
addition, the Audible Alarm may
be
sounded by
CPU
control per the application program.
A description
of
the control, alphanumeric, symbol, and special purpose keys
is
provided below for each type
of
keyboard. The location
of
each key
is
shown
as
it is
discussed. When keys are different
or
are in different locations on the two keyboards,
illustrations
of
both keyboards are provided
so
that the differences may be compared
easily. When the keys are identical on the two keyboards, only the typewriter keyboard
is
shown.
SHIFT
fLOCK
Keys
The SHIFT and LOCK keys are identical
in
function
to
those
of
a standard typewriter.
When the SHIFT key
is
pressed
in
conjunction with a character key, the character
shown on the upper half
of
the key is displayed. When the
k~yboard
is
shifted in
conjunction with a dual-function control key, the function indicated on the upper half
of
that key
is
performed
(Le.,
DUP). Pressing
,a
key without the SHIFTfLOCK,.key
executes the character
or
function shown on the lower half
of
the key.
Pressing the LOCK key locks the keyboard in the shifted position until released by
pressing either SHIFT key.
The
1377
keyboards provide a
fuU
secretarial shift. That is, when the LOCK key is
pressed, the LOCK key remains down until released by pressing eitoer SHIFT key.
This provides the operator with a clear indication that the LOCK key
is
in the pOSition
desired before data
is
typed.
An advantage provided
as
a standard feature
of
the
1377
keyboard is the upperllower
case graphics display. When the, SHIFT/LOCK keys are in
an
unshifted positton,
lower-case alphabetic characters are displayed on the screen; when shifted, upper-
case letters are displayed.
1377
.20-01-3/76
2-4
SPACE Bar
The keyboard SPACE bar
is
interpreted by the 1377
as
any other character entry.
When the SPACE bar is pressed, a space character replaces any character that
appears in the position indicated by the cursor on the display. Therefore, caution
should be taken
not
to use the SPACE bar to reposition the cursor.
The SPACE bar has
an
automatic repeat capability.
CURSOR
CONTROL
Keys
•••• : .j
.••••
:.:
::
::.
:.
The cursor indicates to the operator where the next character entered will appear on
the screen. Eight keys allow the operator to move the cursor
quickly
from one position
to another.
As
noted in the individual key descriptions below; some
of
the CURSOR
CONTROL keys move the cursor one character location at a time, while others move
the cursor from one position on the screen
to
a position on a new line
or
at the
beginning
of
a new field. The CURSOR CONTROL keys have automatic repeat
capability with the exception
of
the
backtabkey.
A brief description
of
each CURSOR
CONTROL key function follows, with illustrations presented
as
required.
1377
.20-01-3/76
2-5
NEW LINE
Key-
Moves the cursor
to
the first unprotected character position on the next line
containing
an
unprotected data field.
If
no unprotected field exists, the cursor returns
to line 1, column 1
of
the screen.
TAB
Key-
(3
Moves the cursor to the beginning
of
the next unprotected data field. If the display is
unformatted, the cursor moves
to
line
1,
column
~.
BACKT
AB
Key-
8
Moves the cursor back to the first unprotected character position in the field in which
the cursor
is
located; if the entire field is protected
or
if
the cursor is located at the
beginning
of
the field, the cursor moves back
to
the first character location in the
preceding unprotected input field.
HORIZONTAL
and VERTICAL POSITIONING
Keys-
OJ
CD
88
Moves the cursor one character position
ata
time in the direction indicated by the
arrow. When located in the last character position in a line
or
column, the
c;:ursor
moves to the opposite side
of
the screen
(Wraps
around) if a positioning key
is
pressed.
In
the case
of
the horizontal keys, the cursor wraps around and appears on
the righthand side
of
the line above
if
the arrow pointing to the left is pressed; the
cursor wraps around and appears on the lefthand side
of
the line below if the key
showing the arrow pOinting to the right is pressed. When either vertical key
is
pressed,
the cursor moves
off
the screen and reappears on the opposite end
of
the screen in the
same column location.
BACKSPACE
Key-
C.
)
Moves the cursor one character position
ata
time to the left; operates the same
as
the
left horizontal positioning key described above.
1377.20-01-3/76
2-6
ALPHABETIC
Keys
The ALPHABETIC keys on the 1377 are identical
to
those
of
a standard typewriter.
Although
only
the upper-case letters appear on the keyboard, lower-case letters
appear on the screen when the letters are typed and the SHIFT/LOCK keys are
not
pressed. The SHIFT/LOCK keys must be pressed in conjunction with
an
ALPHABETIC
key to enter
an
upper-case alphabetic character.
NUMERIC
Keys
Numbers are entered and displayed on the screen by pressing the NUMERIC keys
while the keyboard is in the unshifted position.
1377
.20-01-3/76
2-7
PUNCTUATION MARK and SYMBOL
Keys
Typewriter Keyboard
Operator Console Keyboard
PUNCTUATION MARKS and SYMBOLS are entered and displayed by pressing the
appropriate key while the keyboard is in either the shifted (for characters appearing on
the upper portion
of
the keys)
or
the unshifted (for characters appearing on the lower
portion
of
the keys) position.
SYMBOLS and PUNCTUATION MARKS may be located
indifferent
keyboard
positions
and,in
some cases, may be entirely different on the two types
of
1377
keyboards. The names
of
the PUNCTUATION MARKS and SYMBOLS shown in the
illustrations above are
as
follows:
1377
.20-01-3/76
2-8
UPPER
HALF
OF
NUMERIC
KEYS
TYPEWRITER KEYBOARD
OPERATOR CONSOLE
KEYBOARD
Key
Name
Key Name
I
Logical OR, Vertical Bar
=
Equals Sign
@
At
Sign
<
Less Than Sign
#
Number
Sign
Semicolon
$
Dollar
Sign
Colon
%
Percent Sign
%
Percent Sign
¢
Cent Sign
Apostrophe
&
Ampersand
>
Greater Than Sign
*
Asterisk
*
Asterisk
Left Parenthesis
Left Parenthesis
Right Parenthesis
Right Parenthesis
UPPER/LOWER
PUNCTUATION
MARK
AND
SYMBOL KEYS
TYPEWRITER KEYBOARD
OPERATOR CONSOLE
KEYBOARD
Key
Name Key Name
Underscore
t
Automatic
Underscore }
Automatic
M'
S' , Repeat
' , Repeat
mus Ign
J Capability
Minus Sign
Capability
+
Plus Sign
+
Plus Sign
Equals Sign
&
Ampersand
! Exclamation
Point
¢
Cent Sign
-,
Logical
NOT
Sign @
At
Sign
Colon
! Exclamation
Point
Semicolon
$
Dollar Sign
Quotation
Mark
..
Quotation Mark
Apostrophe
#
Number
Sign
<
Less Than Sign
Logical OR, Vertical Bar
Comma
Comma
>
Greater Than Sign
-,
Logical
NOT
Sign
Period
Period
?
Question Mark ?
Question Mark
/
Slash / Slash
1377
,20-01-3/76
2-9
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