Memorex 1377 Operation manual

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 number7020) using the publication numberto: Memorex
Corporation, Marketing Distribution Center, San Tomas at Central Ex-
pressway, 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-
figurations.
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 FEA-
TURES, 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
appearon 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 78-
key EBCDIC typewriter keyboard (Figure 2-2) and a78-key EBCDIC operatorconsole
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

CLEAR, ERASE INPUT,ERASE EOF, TEST REQ, and RESET Key.
The CLEAR key er~ses the entire screen and returns it to an unformatted state. When
the CLEAR key is pressed, INPUT INHIBITED appears in the status area on the 25th
line
of the display. Keyboard entry is then inhibited until released by the program or by
pressing the RESET key.
The ERASE INPUT key erases all unprotected fields on
the screen and moves the
cursor .to the
first pOSition where data may be entered. If the entire display is
unformatted, the cursor moves to line 1, column 1
of the screen.
The ERASE EOF (End
of Field) key erases all characters from the cursor position to
the end
of the unprotected field in which it is located. The cursordoes not move when
this key is pressed.
the primary function of this key is to correct erroneous data
entered by tabbing to the beginning
of the data field, erasing data entered in that field
by preSSing ERASE EOF, and typing in the correct data.
The TEST REO key signals the computer that a test message is on the screen and
causes INPUT INHIBITED to display on the screen'. Data entry is then inhibited until
released
by the program or by preSSing the RESET key. After TEST REO has been
pressed, the computer should provide further instructions. For details regarding the
use
of this key, the reader should refer to the IBM manual A Guide to Using the Test
~equest Feature on IBM 3270 Information Display Systems, GA27-2774.
The RESET key resets the INSERT MODE and INPUT INHIBITED status indications,
unless data is being transferred to
or from the system. When these indications are not
reset because of data being transferred, the RESET key must be pressed again after
data transfer has
been. completed.
1377 .20-01-3/76
2-10

DUP/PA1 and FIELD MARK/PA2 Keys (Typewriter Keyboard)
PA1 and CNCL Keys (Operator Console Keyboard)
Typewriter Keyboard
Operator Console Keyboard
The PA1 (for both keyboards) and PA2 (typewriter keyboard only) keys provide
Program Access from the keyboard. The function
of these keys is determined by the
program being executed at the time one
of the keys is pressed. After a PA key is
pressed, INPUT INHIBITED is displayed on the screen until reset by the program
or by
preSSing the RESET key.
The DUP key is unique to Display Stations having a typewriter keyboard.
To use this
key, the keyboard must be in the shifted position. When pressed, the DUP key enters a
backward slash
(\) in the cursor position on the display and moves the cursor to the
beginning
of the next unprotected data field. The DUP key signals the program that a
duplication function
is necessary. The program, however, determines the exact
interpretation
of this function.
The FIELD MARK key, also unique to typewriter keyboards, causes
an arrow (-) to be
displayed in the cursor position on the display. This code is normally used when the
display is unformatted to indicate
to the program that the end of a field has been
reached.
The CNCL (Cancel) key normally signals the
computer to erase all data entered in
unprotected fields and moves the
cursor to the beginning of the first unprotected data
field on the screen. The program determines the exact function
of this key.
1377
.20-0 1-3/76
2-11

INS MODE and DEL Keys
The INSERT MODE key allows the operator to enter or correct data in an unprotected
field without changing the data following the insertion. When this key is pressed, the
Display Station enters the Insert Mode. Keyboard operation is
not inhibited unless the
cursor is positioned in a protected field. Once the
cursor has been moved to the
location where
an insertion is necessary, any key entry moves the character in the
cursor location one space to the
right and enters the new character in its place. Each
character is inserted into the location originally occupied by the cursor, shifting the
remaining letters to the right one character position. If necessary, and if the field is
long enough, the characters may move
to the line below to complete the insertion. The
Audible Alarm sounds and the INPUT INHIBITED status appears
if character insertion
attempts to exceed the length
of the field.
The keyboard
is taken out of the Insert Mode by pressing the RESET key.
The DEL key allows the operator
to delete data entered in the keyboard and displayed
on the screen. This is accomplished
by moving the cursor over the character to be
deleted and pressing the DEL key. The character is removed and all characters
following to the end
of the field shift one character position to the left, thereby filling in
the space left by the deleted character. The DEL key must be pressed once
for each
character deletion.
ENTER Key
The ENTER key signals the computer that keyboard entry is complete and ready for
transfer into the computer. When pressed, INPUT INHIBITED appears in the status
area
of the display and input is inhibited until released by the program or by pressing
the RESET key.
1377.20-0 1-3/76
2-12

PF1 Through PF12 Keys
The function performed by pressing a PF (Program Function) key is determined by the
application program being executed at the time the key is pressed. Under one
program, pressing PF1 may Signal the computer to send,a specified form to the
display. The function of PF1 may be entirely different under another appli~ation
program.
2.3 1377 SELECTOR LIGHT PEN
A selector light pen is available as an optional feature of the 1377 Display Station.
When used, the pen selects certain fields displayed on the screen. The addresses of
these fields are then sent to the computer to be used as defined in the program.
A light pen field is denoted by a designator character located at the beginning of the
field. These designators may be either a Greater Than Sign (», a Question Mark (?), or
a null or space character. Whenever a light-pen-detectable field showing a designator
character is selected (tagged), the designator displayed changes (Le., a Question Mark
becomes a Greater Than Sign and vice versa). This indicates to the operator that the
field has been tagged. Selectable fields without a Greater Than Sign or a Question
Mark designator are attention·fields and function like the ENTER key when selected.
To use the selector light pen, the operator presses the tip of the pen against the screen
at a location within the field to be tagged (Figure 2-4). The eh3ctronic eye inside the
pen reacts to the presence of light on the screen by changing the designator.
In operating the selector light pen, care should be taken to make sure thatthe tip of
the pen is placed perpendicular to the screen. Slight tipping of the point may cause
the field above or below the desired selection to be tagged. If this should happen, the
operator simply presses the pen against the tagged field to deselect it and proceeds to
reselect the proper field.
After all correct fields have been tagged, the field addresses are sent to the computer
by pressing the light pen against a selectable field designated by a space or a null on
the screen. These selectable fields are usually identified by the messages they spell
out (i.e., ORDER COMPLETE).
1377.20-01-3/76 2-13