Digital Equipment M7142 User manual

i·
Accessories at Supplies Group
. Merrimack, New Hampshire 03054
serial video module
user guide

M7142 Serial Video Module
User Guide
EK-M7142-UG-001
digital equipment corporation • merrimack, new hampshire

Copyright @ 1979 by Digital Equipment Corporation
The material in this manual
is for informational purposes and is
subject to change without notice.
Digital Equipment Corporation assumes no responsibility for any
errors which may appear in this manual.
Printed in U.S.A.
This document was set on DIGITAL's DECset-8000 computerized
typesetting system.
1st Edition, June
1979
The following are trademarks of Digital Equipment Corporation,
Maynard, Massachusetts:
DIGITAL
DEC
PDP
DECUS
UNIBUS
DECsystem-l0
DECSYSTEM-20
DIBOL
EDUSYSTEM
VAX
VMS
MASSBUS
OMNIBUS
OS/8
RSTS
RSX
lAS

PREFACE
CHAPTER 1
1.1
1.2
1.3
1.4
1.5
CHAPTER 2
2.1
2.2
2.3
2.3.1
2.3.2
2.3.3
2.3.4
2.4
2.4.1
2.4.2
2.4.3
2.4.4
2.4.5
2.4.6
2.4.7
2.4.8
2.5
CHAPTER 3
3.1
3.2
3.3
3.4
3.5
3.6
3.6.1
3.6.2
3.6.3
3.6.4
CHAPTER 4
4.1
4.2
4.3
4.4
4.5
CONTENTS
Page
INTRODUCTION
GENERAL DESCRIPTION .............................................................................. 1-1
MECHANICAL PACKAGING ........................................................................ 1-1
ENVIRONMENTAL SPECIFICATIONS ........................................................ 1-1
OPTIONS........................................................................................................... 1-3
VIDEO CHARACTERISTICS .......................................................................... 1-3
INSTALLATION
SCOPE ...............................,............................................................................... 2-1
UNPACKING AND INSPECTION.................................................................. 2-1
INTERFACE ..................................................................................................... 2-1
Keyboard/M7142 Interface..................................................................... 2-1
Edge Connector....................................................................................... 2-2
Video
Output Connector ........ .......................... ....................................... 2-2
Communications Port Connector... ......................................................... 2-3
INSTALLATION PROCEDURES .................................................................... 2-4
Jumper Configurations............................................................................ 2-4
Data RatesSelection......................................................... ... .................... 2-4
Attributes
and Attribute Control Selection .............................................. 2-6
Communications Selection ................................................................
... ... 2-6
Parity Selection........................................................................................
2-7
Voltage Selection. '" ................................................................................. 2-7
Remote Initialize Selection...................................................................... 2-8
Module Mounting...................................................................................
2-8
CHECKOUT PROCEDURES ........................................................................... 2-9
PROGRAMMING
SCOPE............................................................................................................... 3-1
CONTROL/FUNCTION CHARACTERS ....................................................... 3-1
CURSOR ADDRESSING .................... ~ ............................................................ 3-1
OPTIONAL CHARACTER SETSELECTION................................................. 3-2
DA TA FORMATS ............................................................................................. 3-2
ATTRIBUTES................................................................................................... 3-2
Reverse Video Versus Forward Video...................................................... 3-2
Reverse Video Attribute ...............................,.......................................... 3-2
Blink Attribute........................................................................................
34
Half Intensity .....................................................,.................................... 3-4
APPLICA
TIONS
SCOPE............................................................................................................... 4-1
FULL FEATURE TERMINAL WITH BUILT-IN MONITOR ........................ 4-1
PROCESS CONTROL MONITOR ................................................................... 4-1
SECURITY APPLICATION ............................................................................. 4-1
MUL TIMONITOR APPLICATION ................................................................. 4-2
iii

CONTENTS (Cont)
Page
CHAPTER 5 DIAGNOSTICS
5.\ SCOPE ................................................................................................................
5-1
5.2 REQUIREMENTS ....................................... ~ ..................................................... 5-1
5.3 LOADING P·ROCEDURE.................................................................................. 5-2
5.4 STARTING PROCEDURE ................................................................................ 5-2
5.5
OPERATING PROCEDURE ............................................................................. 5-3
5.6 ERRORS ........................................................,.................................................... 5-3
5.7 RESTRICTIONS ................................................................................................ 5-3
5.8 MISCELLANEOUS .........................................................;......,.......................... 5-3
5.9 PROGRAM DESCRIPTION (SCREEN)........................................................... 5-3
APPENDIX A CUSTOM
CHARACfER SET GENERATION
Figure
No.
\-\
1-2
\-3
2-1
2-2
2-3
3-1
3-2
3-3
3-4
3-5
3-6
4-1
4-2
4-3
4-4
5-1
A-\
A-2
A-3
FIGURES
Title Page
Port Interaction
.................................... ' ................. " 1-2
Mechanical Packaging .................................................. 1-2
Video Image .......................................................... 1-3
Connector Pin Number Location Diagram ................................ 2-1
Select RS423/20 rnA Loop. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2-3
Jumper and Wire Wrap Post Locations ................................... 2-5
ASCII Character Set .................. '.' ............ ' ................. " 3-3
Attribute Selection Flow ................................................ 3-3
Reverse Video and Blink Attribute .................... , .................. 3-4
Forward and Reverse Video Displays
..................................... 3-5
Forward Video with Blink Attribute ...................................... 3-6
HalfIntensity Wire Wrap Removal
....................................... 3-7
Full Feature Terminal
.................................................. 4-1
Process Control Monitor . ' .............................................. 4-2
Blink Attribute and Alarm Status
........................................ 4-2
Multilocation Tabular Data Display ..................................... 4-3
Cursor Motion Test Display
............................................ 5-4
ROM Address/ROM Content Relationship
............................... A-I
Standard Character (ASCII
0438) ........................................ A-3
New Character (ASCII
0438) ......................................... , .. A-3
iv

Table No.
2-1
2-2
2-3
2-4
2-5
2-6
2-7
2-8
2-9
2- IO
2-11
TABLES
Title Page
KeyboardjM7142 Connector (J2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2-2
M7142 Edge
Connector ........................ , ....................... 2-2
Video
Output Connector (J I) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2-3
Comm unication Port Connector (J3). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2-4
Factory Installed Jumper Configurations .............. , .. , ............... 2-6
Data Rate Jumper Configurations ....................................... 2-6
Attribute Jumper Configurations ........................................ 2-7
Comm unications Jumper Configurations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2-7
Parity Jumper Configurations .......................................... 2-8
Voltage
Jumper Configurations ....................... ; ...... , .......... 2-8
Remote Initialize Jumper Configurations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2-8
v

PREFACE
This manual describes DIGITAL's M7142 Serial Video Module. It includes descriptions, specifica-
tions, programming, and interfacing information on the M7142.
The section on applications presents
examples
of how the M7142 can enhance present system operation.
vii

1.1 GENERAL DESCRIPTION
CHAPTER 1
INTRODUCTION
The M7142 module forms an integral part of a terminal. The module accepts serial ASCII encoded
data to be stored in a refresh memory to generate a display for a video monitor. The M7142 also
accepts parallel data from a keyboard terminal (on strobe demand) to generate serial
ASCII output.
Interaction with the M7142
is accomplished via four ports (see Figure I-I):
• Communication Port -Data from the communication input port is sorted to form two
internal streams
of data: control characters, e.g., LF, CR, VT (see Chapter 3) are fed to the
control logic;
data is fed to the data storage memory.
Data storage memory is continuously scanned and the contents are used to generate a video
output for an external monitor.
• Keyboard Port -The keyboard port operates independent from the rest of the module. It
translates parallel ASCII data to serial
data to drive the communications output port.
• Video Port -The video port provides a data path to the external monitor for data display.
• Power Port -Power input is dependent upon the option used (see Section 1.4).
1.2 MECHANICAL PACKAGING
The M7142
is an extended-length, double-height, single-width board. Mounting holes are provided for
stand-offmounting via handle rivets and two holes located near the module fingers (see Figure
1-2).
1.3 ENVIRONMENTAL SPECIFICATIONS
The M7142 module operates under the following conditions:
• Environment must conform to:
Temperature
SoC to 60°C
Humidity
10% to 95% (no condensation)
• Power dissipation is based on circuit requirements of 1.8 amps maximum. If only 5 Vdc is
used, power dissipation does not exceed 9 watts. An additional 2 watts (normal) is dissipated
when the ±HV (nominal 12 volts) is enabled.
1-1

r---------~---------------------------------,
I ~~
I
I
I
I
I
CLK
BAUD RATE SEL
CNTR'L~
CHARV
CONTROL
LOGIC
MEM & SCROLL
L_
------,
COMMUNI·
.!J
I
CATION
RCV DATA
I
PORT
!
DATA~
CURSOR
XMIT DATA !
MEMORY
&
V
ATTRIBUTE
I
SERIAL ASCII :
VIDEO
LOGIC
r _..J rt1) ADIlAS
I KB PORT PARALLEL
I ASCII
I
L _j- _________ ,;,...,
~
. .
. . , . , '
, , , .
DEC -15V !
..
I
PWR
~ -HV
LSI·11 + 12V ! ..
SUPPLY
+HV
i~
L.. ___________________ J
8.43 ±.01
Figure I-I Port Interaction
4.750±·OO2 -
1.219 ±.O1
t
()
M7142
J;-
4.80
1 +.015
1~"----5.187 - .020
-
+
. 18Typ
7.44
.2Typ
--"
T
-I
Figure 1-2 Mechanical Packaging
1-2
HOLES ARE .125d
±.01
MK·0884
VIDEO
DATA
EXTERNAL
MONITOR
MK·0686

1.4 OPTIONS
The options designated below may be either customer selected or DIGITAL selected.
• Communication Port:
Electrical interface operates in either Electronic Industries Association (EIA) RS423
or con-
ventional
DEC 20 milliamp passive current loop.
• Power Input:
Power
input is regulated +5 Vdc at 1.2 amps typical. If the RS423 communications interface
is selected, a source
of +12 volts or -15 Vdc is required at 150 milliamps typical.
• Character Sets:
Space for two
character set ROMs is available. One of two optional character sets may be
selected by the attribute.
At power up, the standard graphics are enabled. The standard character set ROM is soldered
in place. A 24-pin socket
is provided for installing an optional graphics RO M. A 2716/2316
or equivalent may be used to hold two optional character sets.
• Keyboard Power:
Keyboard power is available at the keyboard data connector (12) to allow operation with a
keyboard such as
the DEC LK02. Current should not exceed 100 milliamps of +5 volts
and/ or 10 milliamps of -12 volts.
1.5 VIDEO CHARACTERISTICS
• The video image consists of 25 lines of 80 characters each presented in adjacent 8 X 8 dot
cells (see Figure 1-3).
Horizontal Frequency = 15.36 kHz
Vertical Frequency = 60 Hz
Horizontal scan lines per frame = 256 lines
0,
to
CHARACTER
MATRIX
8x8
CHARACTERS
80 TOTAL
(640 DOTS)
-CHARACTER
LINES, 25 TOTAL
(200 DOTS)
Figure 1-3 Video Image
1-3
MK·0676

• The standard character font is presented in a 7x 7 dot portion of the 8 x 8 dot cells.
• Smooth scrolling rolls a clear line into the bottom of the image display. It is used whenever
an attempt
is made to move the cursor down with a line feed (LF) or a vertical tab (VT) after
the cursor has reached the bottom line.
• Direct cursor addressing is available (VT52 compatible). See Section 3.3, CURSOR AD·
DRESSING.
• Character attributes are available allowing selection of blink, forward and reverse video,
alternate character set,
or half intensity. The selected attribute may be set/cleared with bit 8
of the received data or with ASCII characters SO/SI (Shift Out/Shift In).
• The cursor is a flashing reversed video cell with a 500 millisecond nominal period and a
reversed duty
of 60% to 80%.
1·4

2.1 SCOPE
CHAPTER 2
INSTALLATION
This chapter contains the procedures for unpacking, installing, and the initial checkout of the M7142.
More detailed checkout procedures are outlined
in Chapter 5 of this manual.
2.2 UNPACKING AND
INSPECTION
The M7142 is packaged in accordance with commercial packaging practices. First, remove all packing
material and check the equipment against the shipping list. Report damage or shortages to the shipper
immediately and notify
the DIGITAL representative. Inspect all parts of the module for cracks, loose
components, and separations in the etched paths.
2.3 INTERFACE
This section describes the sequences
of signal exchanges that occur among the M7142 and other ex ter-
nal devices. Refer to Figure
2-1 for the pin number locations of the interfacing connectors.
J3
J1
1 2 3 4 5
o 0 0 0 0
o 0 0 0 0
1000001
108 6 4 2
J2
00000 000 0 0
000 0 0 Q0 0 0 0
2018161412108 6 4 2
Figure 2-1 Connector Pin Number Location Diagram
2.3.1 KeyboardjM7142 Interface
MK·0689
The keyboard interfaces to the M7142 via a 20-pin connector(J2). Table 2-1 presents the connector pin
numbers and associated signal names.
2-1

Table 2-1 KeyboardjM7142 Connector (J2)
Pin No. Signal Name Pin No. Signal Name
1
+5 Volts
11
KB4
2 -12 Volts
12 Not used
3
GND 13 KB3
4 KB8
14
BREAK (GND)
5 KB7
15 KB2
6
GND
16 GND
7 KB6
17
KBI (LSB)
8
KBSTRBH
18 GND
9 KB5 19 Not Used
10 BREAK
20
Not Used
2.3.2 Edge Connector
M7142 edge connector pins and associated signals are presented in Table 2-2.
Table 2-2 M7142 Edge Connector
Pin No.
AA2,BA2
AC2,ATI,BC2,BTI
AB2
AD2
OTHERS
2.3.3 Video Output Connector
Signal Name
+5Vdc
GND
-15 Volts
+ 12 Volts
Not Connected
Video output is provided as RS170 compatible and as separate TTL output lines. A 5-pin MOLEX·
connector (Jl) is used with pin assignments as shown in Table 2-3. (Mating connector = DIGITAL
Part No. 12-10547; Pins = DIGITAL Part No. 12-14979.)
Composite video output provides RS
170 output generated by combining the video signal with a com-
posite sync signal. The picture signal from the balancing level to reference white across 75 ohms is 1
volt. The synchronizing levels are imposed
at 40% of the signal.
*Vendor Trademark
2-2

Pin No.
5
4
3
2
ovolts = SYNC
0.4 volts =BLACK
1.4 volts = WHITE
Table 2-3 Video Output Connector (Jl)
Signal Name TimingjFreq
HORIZONTAL DRIVE H 15.36 kHzj27 f.Ls.
VERTICAL DRIVE L 60 Hzj520 f,J,s.
VIDEO HI Z
GND
RS 170VIDEO
For direct drive output, jumper W4 must be cut providing a high impedance source at the MOLEX*
connector, pin 3. The M7142 has been tested with the following direct drive monitors:
ITOH,
Ball Brothers,
Elston.
2.3.4 Communications Port Connector
The communciations port is a to-pin connector (J3), pinned for direct DLVII-J connection. The
electrical interface may be wired for RS423 or 20 rnA communication (see Figure 2-2). Table 2-4
presents the pin assignments
and associated signal names.
J3
RCV DATA -7 UA18
8
UA21
RECV DATA +
*Vendor Trademark
WIRE·WRAP
/\A19
......
UA20
UA22
""
20
MA
RS
423
KYBD MEM
Figure 2-2 Select RS423j20 rnA Loop
2-3
J3
WIRE·WRAP
~~
", UA34 3
XMIT+
UA36 4
-J.)---t..-t-< XMIT -
MK 0686

Table 2-4 Communications Port Connector (J3)
PinNo.
2
3
4
5
6
7
8
9
10
2.4 INSTALLATION PROCEDURES
Signal Name
CLOCK I/O
GND
XMITDATA+
XMITDATA-
GND
NOT USED/POLARIZING POINT
RCVDATA-
RCVDATA+
GND
20mA SOURCE
The following sections describe the installation of the M7142 module.
2.4.1 Jumper Configurations
Figure
2-3 illustrates the locations of the various jumpers and wire wrap posts of the M7142. Verify
that the factory installed jumpers are configured per Table 2-5. Any jumper configuration changes
required for user application should be
made at this time.
2.4.2
Data Rates Selection
The
data rates are generated via a 13.5168 MHz crystal and selected through a dual 4-bit decade and
binary counter. The following data rates are selectable: ISO, 300, 600, 1200, 2400, 4800, 9600, 19200,
and 38400.
The
UART may be configured to transmit and receive at either the same data rate or at split data rates.
Data rates are configured by connecting a jumper from the selected data rate wire-wrap pin to the
clock
input pin(s) of the UART. When configuring at the same data rate, the wire-wrap pins may be
daisy-chained. Table 2-6 lists the
data rates and their respective pin numbers.
The UART can be configured to operatefrom an external clock source via pin I of J3. Both UA26 and
UA27 must be jumpered to the external clock. Do not select a data rate pin when using an external
clock.

UUU UUUUU UUU
W2 X
UA34
AAA AAAAA AAA
_x
UA33
2 1 1 66656
W4
UU
222 X
UA32
098 o 1 293
-
AA
1 23
X
UA35
XXX
W5
XXXXX 87
XXX
_X
UA36
-
XX
W1
X
UA37
UUU
X
UA24
AAA
444 X
UA25
123
XXX
X
UA27
X
UA26
X
UA12
X
UA17
X
UA16
X UAll
UUU
X
UA15
AAA
X
UA10
343 X
UA14
W3
809
W7 X
UA13
_ XXX
-X
UA9
- -
W8 W6
X
UAl
X
UA6
X
UA5 ..
X
UA3
M7142
X
UA4
-
~
r--
MK-067S
Figure 2-3 Jumper and Wire Wrap Post Locations
2-5

Table 2-5 Factory Installed Jumper Configurations
Jumper
WI
(or VAl toVA5)
W2 (or VA4 to VA6)
W4
W7
VA59 to VA61 to VA62
VAl8 to VA20
VA21 to VA23
VA34 to VA32
VA36 to VA37
W3
VA39to UA40
W5
UA41 to UA43
UA26 to UA27 to
UA 15
Function Implemented
+ 12 V Operation
RS170 Operation
Form Feed Receive enabled for Remote
Initialization
8-bit -
No Parity
EIA RS423 Operation
E52 Character Set Enabled
SI/SO (Shift In/Shift Out) Attribute
Control
Forward Video
Blink attribute enabled
9600 Data Rate selected
Table 2-6 Data Rate Jumper Configurations
FROM
Tran smitclock
pin UA27
and/or
Receiver clock
pin UA26
\
TO
2.4.3 Attributes and Attribute Control Selection
Pin
VA9
VAlO
VAll
VAl2
VAl3
VAI4
UAl5
VAl6
VA17
Data Rate
150
300
600
1200
2400
4800
9600
19200
38400
Several jumpers are used for attribute and attribute control selection. Table 2-7 lists the various attri-
bute and attribute control configurations.
2.4.4 Communications Selection
Four jumpers are used for communications selection. Table 2-8 lists the jumper configurations re-
quired for either EIA RS423 or 20 rnA current loop communications.
2-6