Digital Equipment VS240-B User manual

[phone] | [email protected] | artisantg.com
-~
ARTISAN
®
~I
TECHNOLOGY
GROUP
Your definitive source
for
quality
pre-owned
equipment.
Artisan Technology
Group
Full-service,
independent
repair
center
with
experienced
engineers
and
technicians
on staff.
We
buy
your
excess,
underutilized,
and
idle
equipment
along
with
credit
for
buybacks
and
trade-ins
.
Custom
engineering
so
your
equipment
works
exactly as
you
specify.
•
Critical
and
expedited
services
•
Leasing
/
Rentals/
Demos
• In
stock/
Ready-to-ship
•
!TAR-certified
secure
asset
solutions
Expert
team
ITrust
guarantee
I
100%
satisfaction
All
tr
ademarks,
br
a
nd
names, a
nd
br
a
nd
s a
pp
earing here
in
are
th
e property of
th
e
ir
r
es
pecti
ve
ow
ner
s.
Find the Digital Equipment VS240-B at our website: Click HERE

EK-VT240- TM-001
VT240 Series
Technical Manual
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

EK-VT240- TM-001
VT240 Series
Technical Manual
Prepared by Educational Services
of
Digital Equipment Corporation
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

1st Edition, August 1984
Copyright © 1984 by Digital Equipment Corporation.
All Rights Reserved.
Printed in U.S.A.
The reproduction of this material, in part or whole, is strictly
prohibited. For copy information, contact the Educational Services
Department, Digital Equipment Corporation, Maynard, Massachusetts
'H754.
The information in this document is subject to change without
notice. Digital Equipment Corporation assumes no responsibility
for any errors that may appear in this document.
This equipment generates and uses radio frequency energy and if
not installed and used properly, that is, in strict accordance
with the manufacturer's instructions, may cause interference to
radio and television reception. It has been type tested and found
to comply with the limits for a Class B computing device in
accordance with the specifications in Subpart J of part 15 of FCC
Rules, which are designed to provide reasonable protection against
such interference in a residential installation. However, there is
no guarantee that interference will not occur in a particular
installation. If this equipment does cause interference to radio
or television reception, which can be determined by turning the
equipment off and on, the user is encouraged to try to correct the
interference by one or more of the following measures:
reorient the receiving antenna
relocate the computer with respect to the receiver
move the computer away from the receiver
plug the computer into a different outlet so that computer and
receiver are on different branch circuits.
If necessary, the user should consult the dealer or an experienced
radio/television technician for additional suggestions. The user
may find the following booklet prepared by the Federal
Communications Commission helpful:
"How to Identify and Resolve Radio-TV Interference Problems".
This booklet is available from the US Government Printing Office,
Washington, DC 20402, Stock No. 004-000-00345-4.
The following are trademarks of Digital Equipment Corporation,
Maynard, Massachusetts.
momoomD
DECwriter
P/OS
UNIBUS
DEC DIGITAL
Professional
VAX
DECmate LA
Rainbow VMS
DECnet MASSBUS
RSTS
VT
DECUS PDP
RSX Work
Processor
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

INTRODUCTION
CHAPTER 1
1.1
1.2
1. 2.1
1. 2.2
1. 2.3
1.3
1. 3.1
1. 3.2
1. 3.3
1.4
loS
1.6
1. 6.1
1. 6. 2
1. 6. 3
1. 6. 4
1. 6. S
1. 6.6
CHAPTER 2
2.1
2.2
2.3
2.4
2.S
2.S.1
2.S.2
2.S.3
2.S.4
2.S.S
2.S.6
2.S.6.1
2.S.6.2
2.S.7
SYSTEM INTRODUCTION
Genera 1 .......•.••..•.
Physical Description
System Box (VS240)
Keyboard (LK201)
Monitor ...•..•.•
Display Capabilities
Display Characteristics
Text Capabilities .•••.
Graphics Capabilities
Communications Environment
Major Operating States
Operating Modes •..•.••.
VT100 Mode •••.••••
VT200 Mode, Seven-Bit
VT200 Mode, Eight-Bit
VTS2 Mode •.•..
ReGIS Mode
4010/4014 Mode
Controls
Controls
CONTROLS, INDICATORS, AND CONNECTORS
General
System Box (VS240)
Monochrome Monitor (VR201)
Color Monitor (VR241)
Keyboard (LK201)
Main Keypad
Editing Keypad •.....•••••••.
Auxiliary Keypad .....••......•.•
Top-Row Function Keys
Visual Indicators
Audible Indicators
Audible Keyclick •.•••
Be 11 ••••••••••••••••
Connector Cable
iii
CONTENTS
1-1
1-1
1-1
1-3
1-3
1-3
1-4
1-4
l-S
I-S
I-S
1-6
1-6
1-6
1-6
1-7
1-7
1-7
2-1
2-1
2-2
2-4
2-S
2-7
2-8
2-8
2-9
2-9
2-11
2-11
2-11
2-12
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

CHAPTER 3
3.1
3.2
3.2. 1
3.2.2
3.2. 3
3. 3
3.3.1
3.3.2
3.3. 3
3.3.4
3.3. 5
3.3.6
3.3. 7
3.4
CHAPTER 4
4.1
4.2
4.2.1
4.2.1.1
4.2.1.2
4.2.2
4.2. 3
4.2.4
4.2. 5
4.2.6
4.2. 7
4.2.8
4.2. 9
4.2.113
4.2.11
4.2.11.1
4.2.11.2
4.2.11.3
4.2.12
4.2.13
4.2.14
4.2.15
4.3
4.4
CHAPTER 5
5.1
5.2
5.2.1
5.2.1.1
5.2.1.2
5.2.1.3
SYSTEM OVERVIEW
Genera 1 ...................••
Operating States ........ .
Set-Up
Local
On-Line
System Architecture
CPU Logic ........••..••••
Video Logic
System Communication
Logic
(Opt ion) Integral Modem
Power Supply .....
Keyboard
Monitor
System Interaction ......•.
CPU LOGIC
Genera 1 .•......•..•.......
Major Circuits/Components
Central Processor Unit ....•.
T11 Internal Circuits
T11 Transactions
Mode Register
Control Gates •••••.
Address Latch ........••.
Decode
Memory Map
Memory Access
Read Only Memory (ROM)
(RAM) Ra ndom Access Memory
I/O Buffer .....•..
I/O Decode ......•.
Keyboard Interface (I/F)
8251A USART Internal Circuits •••••
8251A USART Addresses .•.......•••••.
8251A USART Timing Diagrams ..••....•.
Nonvolatile RAM (NVR)
Interrupt Control
Command Register
Clock Generator ..••••••••
Signal Descriptions
Schematic Reference Information
SYSTEM COMMUNICATION LOGIC
Genera 1 .••••..••••••.....•••..•..•••..•.•••
Major Circuits/Components •.......•••...••..
Dual Asynchronous Receiver/Transmitter
(DUART)
2681 DUART
2681
2681
DUART
DUART
Internal Circuits
Addresses ..••••
Timing Diagrams •....••••••
iv
3-1
3-1
3-1
3-2
3-2
3-3
3-4
3-4
3-5
3-5
3-5
3-5
3-6
3-6
4-1
4-2
4-3
4-4
4-6
4-12
4-12
4-15
4-15
4-18
4-18
4-19
4-22
4-23
4-26
4-27
4-29
4-313
4-31
4-33
4-34
4-35
4-35
4-35
5-1
5-2
5-2
5-4
5-6
5-6
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

5.2.2
5.2.2.1
5.2.2.2
5.2. 3
5.2.4
5.2.5
5.2. 6
5.2.7
5.3
5.4
CHAPTER 6
6.1
6.2
6.2.1
6.2.1.1
6.2.1.2
6.2. 2
6.2.3
6.2.4
6.2.4.1
6.2.4.2
6.2.4.3
6.2. 5
6.2.5.1
6.2.5.2
6.2.5.3
6.2.5.4
6.2.5.5
6.2.5.6
6.2.6
6.2.7
6.2.7.1
6.2.7.2
6.2.7.3
6.2.8
6.2. 9
6.2.10
6.2.11
6.2.12
6.2.13
6.2.14
6.2.15
6.2.16
6.3
6.4
Communication/Modem (Comm/Modem) Control ...
Comm/Modem Control Circuits ....•••••...
Comm/Modem Control Addresses .••••••••••
Communication Mul tiplexer (Comm Mux) •••••.•
Printer Interface (I/F) .•••.••••.••••••••••
EIA Host Interface (I/F) ••..........•...•••
20 rnA Interface (I/F) •.••••••••••••••••••••
Integral Modem Option Connector (J5) ......•
Signal Descriptions .•..••••••••.••.••••.•.•••..
Schematic Reference Information .•..••••••.•••..
VIDEO LOGIC
5-8
5-9
5-11
5-12
5-12
5-14
5-14
5-16
5-17
5-17
General ........................................ 6-1
Major Circuits/Components •.••••••••••••••.•..•• 6-2
Character Processor (CP) ••....•..•.••.••••• 6-2
8085A-2 Microprocessor Device Internal
Ci rcui ts ............................... 6-5
8085A-2 Microprocessor Device
Transactions .......................... .
Character Processor (CP) Memory .•.........•
Video Access •••••.•.......•.••.•.•..•••....
Graphics Processor •.•..••..•••••••.•.....•••
PD7220 Graphics Display Controller
(GDC) Internal Circuits •....•..•.•••••.
PD7220 Graphics Display Controller
(GDC) Addresses ..••••••.••.•..•.•••••..
PD7220 Graphics Display Controller
(GDC) Transactions ....••.••....•..••••.
Timing and Control Circuits ..••.•.......••.
Clock Generator .......•.••••.•........•
BEN and STOP Gates .•..••.....•••..•.•..
ROM Address Counter .••.•••.•.•..•••.••.
Timing Signal Generator ...•.••••......•
Read-Modify-Write (RMW) Generator .•...•
BLANK Genera tor .•.....•...•....•••••••.
Mode Select •••••••••....•...••••••••..•....
Bit Map Addressing Circuit .•..••••••.......
Plane and Byte Select ••...........•••••
Address Select ........................ .
Row/Column Mux .....•.......•...•.•.•.••
High/Low (Hi/Lo) Byte Select ......••..•••••
Bit Map Write Enable •...••..•••••....•.••..
Pattern Select ............................ .
Logic unit ................................ .
Write Data Select •••...•••.•.•.••••••...•••
Bit Map •••..........................•••••••
Parallel-to-Serial (p/S) Converter ..•••••.•
Output Map ....•.•••••.•.•••••.•....•••••••.
Digital-to-Analog (D/A) •.••.........•.•.•.•
Signal Descriptions •.•.•••.........•.•.••••..•.
Schematic Reference Information ..•.•••••••.•...
v
6-6
6-8
6-9
6-12
6-12
6-14
6-18
6-22
6-23
6-24
6-24
6-24
6-26
6-27
6-28
6-29
6-30
6-31
6-32
6-32
6-34
6-35
6-37
6-39
6-40
6-41
6-43
6-46
6-47
6-47
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

CHAPTER 7
7.1
7.2
7.3
7.3.1
7.3.1.1
7.3.1.2
7.3.2
7.3.2.1
7.3.2.2
7.3.2.3
7.4
7.4.1
7.4.2
7.4.3
7.4.4
7.4.4.1
7.4.4.2
7.4.5
7.4.6
7.4.7
7.5
7.5.1
7.5.2
7.5.2.1
7.5.2.2
7.5.2.3
7.5.3
7.5.3.1
7.5.3.2
7.5.4
7.5.4.1
7.5.4.2
7.5.4.3
7.5.5
7.5.5.1
7.5.5.2
7.5.5.3
7.5.5.4
7.5.6
7.5.6.1
7.5.6.2
7.5.6.3
7.5.6.4
7.5.6.5
7.5.7
7.5.7.1
7.6
LK2131 KEYBOARD
Genera 1 •.•.....•.•..•.•.•••••••••••••••••••••••
Physical Description ••••••••••••••.••••••••••••
Functional Description •...••••.•••..•.•••••.•••
Keyboard Operation Overview .••••.•......•••
Keyboard Scanning ...•...••••••••••.••••
Control of Audio Transducer and
Indicators ............................ .
Keyboard Firmware Functions ••..••••••••.•.•
Functions Not Changed by CPU
Instructions .......................... .
Functions Changed by CPU Instructions .•
Firmware Functions Changed by CPU
Instructions .......................... .
Detailed Keyboard Circuit Description •.••••••••
Keyboard Matrix Scanning ..••...••••••••••••
Audio Transducer Control Circuit ..•••••••••
Indicator (LED) Control Circuit ••••••..•.••
Keyboard Communication •••••••••••••••••••••
Keyboard Transmit Mode •••••••••••••••••
Keyboard Receive Mode ••••••••••••••••••
Reset Signal for 81351 Microprocessor •••••••
Hardware Keyboard Identification (ID) ••••••
Voltage Supplies •••.••..••.••••••••••••.••.
Keyboard Programming ••.••••••••••••••••••.••••.
Keyboard Layout and Key Identification .••.•
Modes ••••••••••••••••••••••••••••••••••••••
Special Considerations Regarding
Autorepea t ............................ .
Special Considerations Regarding
Down/Up Mode •.....••...••••••••.••••..•
Autorepeat Rates •••••••••••.•••••••••••
Keyboard Peripherals ..•.••••.•••.•.••••••••
Aud i 0 ••••••••••••••••••••••••••••••••••
Indicators (LEDs) ••.••...••.••..•......
Keyboard-to-System Module Protocol •...•...•
Keycode Transmission .......••.•.....••.
Special Code Transmission ......•.•.••••
Power Up Transmission ....••....•.•.••.•
System Module to Keyboard Protocol ..•.•••••
Comma nd s •••••••••••••••••••••••••••••••
Parameters ............................ .
Peripheral Commands •....••...•.•.•••••.
Mode Set Commands ..••.•••••.•.••.•..•••
Special Considerations ..•..•.••••••••••••..
Error Handling .•.•••..•.•..•.•••.•..•••
Keyboard Locked Condition ••..••....••••
Reserved Code .••••..••.•...•........•.•
Test Mode ••••••••••••••••••••••••••••••
Future Expansion ......•.....••••••.....
Default Conditions •....•..••.••.•••••••..••
Audio Volume .......................... .
Specifications
vi
7-1
7-2
7-4
7-4
7-5
7-5
7-5
7-5
7-6
7-6
7-6
7-6
7-14
7-14
7-16
7-16
7-16
7-17
7-17
7-17
7-17
7-17
7-23
7-23
7-25
7-25
7-26
7-26
7-26
7-27
7-27
7-27
7-29
7-29
7-313
7-313
7-31
7-36
7-38
7-38
7-39
7-39
7-39
7-39
7-413
7-413
7-41
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

CHAPTER 8
8.1
8.2
8.3
8.3.1
8.3.2
8.4
8.4.1
8.5
8.6
8.7
8.7.1
8.7.2
8.7.3
8.7.4
8.7.5
8.7.6
8.7.7
8.7.8
8.7.9
8.7.10
CHAPTER 9
9.1
9.2
9.2.1
9.2.2
9.2.3
9.2.4
9.2.5
9.2.6
9.2.7
CHAPTER
10
10.1
10.1.1
10.1.2
10.1.3
10.1.3.1
10.1.3.2
10.2
10.2.1
10.2.2
10.2.3
10.2.4
10.2.5
10.2.6
10.2.7
10.2.8
10.2.9
10.3
MONOCHROME MONITOR
Gener a 1 ••••••••.••••
Physical Description
Functional Overview
VIDEO Da ta
SYNC Da ta
Monochrome Monitor System Communication
Composite Video Signal ••••••••••••
CRT
Yoke ••••.••...•
Monitor Module
Dynamic Focus
Grid Bias
Horizontal Deflection
Linear Regulator
Vertical Deflection
Video Amplifier (Amp)
Flyback Transformer
Jl
J2
Pi ...... .
POWER SUPPLY
Genera 1 ••••••••••••••.•••••••••
Major Circuits/Components •...•••
AC Input and Fan Components •••••
Power Supply 1 (PSI)
DC Power Input Connector (Jl)
+5 V Input Circuit
+12 V Input Circuit
-12 V Input Circuit
DC Power Okay Circuit
INTEGRAL MODEM OPTION
General ...................... .
Compatibility and Features
Functional Description
Physical Description
Power Requirements
Temperature and Humidity •••..
Major Circuits ••..•••......
Talk/Data Relay Circuit
Switch Hook Detector Circuit •.•••
Ring Detector Circuit
Hook Relay Circuit
Line Interface Circuit ..•••••••
Dial Tone Detect Circuit
Audio Coupler Circuit
Master Clock Circuit
Modern Control LSI Circuit ••••.
Terminal Interface Signal Description
vii
8-1
8-2
8-4
8-5
8-5
8-5
8-7
8-10
8-11
8-11
8-12
8-12
8-13
8-13
8-14
8-14
8-15
8-16
8-16
8-16
9-1
9-2
9-3
9-4
9-14
9-14
9-15
9-16
9-16
10-1
10-2
10-2
10-3
10-4
10-4
10-4
10-4
10-6
10-6
10-6
10-6
10-7
10-7
10-10
10-10
10-11
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

10.3.1
10.3.2
10.3.2.1
10.3.2.2
10.3.2.3
10.3.2.4
10.3.2.5
10.3.2.6
10.3.2.7
10.3.2.8
10.3.2.9
10.3.2.10
10.3.2.11
10.3.2.12
10.3.2.13
10.3.2.14
10.3.2.15
10.3.2.16
10.3.2.17
10.3.2.18
10.3.2.19
10.3.2.20
Signal States •.••••••.•....•.•••••••••••••. 10-12
Interface Signals •.•...•••••••••••••.•••... 10-12
Transmitted Data (TO) ••••.••••••••••••• 10-12
Received Data (RD) ••••••••..•..•.•.•••• 10-14
Clear to Send (CTS) •••••••••••.•...••.• 10-14
Data Set Ready (DSR) •.•••••••.....•..•• 10-14
Signal and Power Ground ••••••••••••...• 10-14
Carrier Detect (CD) •••••••••••••••••••• 10-14
Speed Indication (CI) •••••••••••....•.. 10-14
Data Terminal Ready (DTR) •••.•••••••••• 10-14
Data Rate (Speed) Select (CH) •.•....... 10-15
Dial Tone Detect (DTD) •.•••...•••••.••• 10-15
Line Switch (Talk/Data) •••••..••...•••• 10-15
Data Available (DA) ••.•.•••••••••••.••• 10-15
Off Hook Drive (OH-D) •••.••••••••••••.. 10-15
9- or 10-Bit Character (9/10 SEL) •..•.• 10-15
Coupler Cut Through (CCT) •.•.•.•....... 10-15
Switch Hook (SW) ••••.....••••••••••••.. 10-15
Off Hook Modem (OH-M) .•••...•••••••••.. 10-15
Analog Loop Test (ANL) ••....•.•••••••.• 10-16
Remote Data Loopback Test (RDL) ..••••.. 10-16
Test Mode Indicate (Test IND) •••..••••• 10-16
APPENDIX A SPECIFICATIONS
APPENDIX B VT240/VT102 DIFFERENCES
APPENDIX C VT240/VT125 DIFFERENCES
APPENDIX D REGISTER BIT VALUES
APPENDIX E VIDEO LOGIC WRITE MODE PROGRAMMING OVERVIEW
FIGURES
1-1
1-2
2-1
VT240 Series Video Terminals •.•••.••••.••...•••
VT240 Series Terminal Block Diagram .•••...•.•••
System Box Controls, Indicators, and
1-2
1-2
Connectors ..................................... 2-1
2-2
2-3
2-4
2-5
2-6
2-7
2-8
2-9
3-1
3-2
3-3
VR201 Monitor Controls, Indicators, and
Connectors ..................................... 2-3
VR241 Monitor Controls, Indicators, and
Connectors (Front and Rear) •.••..•••••••.•.....
Keyboard (North American) ...••.••.••..••.••.•••
Main Keypad .•.••.....•••••..••••••••.......•...
Ed i ti ng Keypad ••••••••.••••••••••••••••••••••••
Auxiliary Keypad •.•...••.•••.•.••.......•.•..•.
Top-Row Function Keys and LEOs .••.•••..••.....•
Connector for BCC01 Cable ••........•..•.•••••..
VT240 Series Terminal System Block Diagram •.•..
System Interaction in Set-up ••.•.......••••..•.
System Interaction in Local (Printer Port
2-4
2-6
2-7
2-8
2-8
2-10
2-12
3-3
3-6
Inactive) ...................................... 3-7
viii
(,
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com