Control Data Corporation CDC 40003-22 Owner's manual

&J E:\ CONT~OL DATA
~ r:::J CORfO~TION
CDC Ql) 40003-22/23
INFORMATION SYSTEMS TERMINAL IB
HARDWARE MAINTENANCE MANUAL
(SITE AND ' SUPPORT INFORMATION)
"
62940007

Should difficulties be encountered in
installing, testing, or running this
equipment, you may obtain assistance by
contacting your CDC sales representative
for the telephone number applicable to
your installation. After obtaining the
number, write it here for future
reference:
TELEPHONE NUMBER ____________________ __

f':j c:\ CONTR..OL DATA
\!:I r::J CO~ORATION
62940007
CDC®INFORMATION SYSTEMS TERMINAL m
HARDWARE MAINTENANCE MANUAL
(SITE AND SUPPORT INFORMATION)

1
1 REVISION
RECORD
1 ______ _
1 -,-
1
1 REVISION DESCRIPTION
-----------------r-------------------------------------------------------------
01
(07-24-80)
A
(12-02-80)
B
(01-23-81)
C
(03-04-81)
D
(03-31-81)
E
(01-21-82)
F
(04-08-82)
G
(11-30-82)
H
(05-18-83)
J
(11-04-83)
Publication No.
62940007
Preliminary edition.
Manual released. Includes ECOs 14228, 14277, 14284,
14306, 14326, 14346, and 14369. This edition obso-
letes all previous editions.
Incorporates technical and editorial corrections and
ECO 14388, ECO 14444, and ECO/FCO 14422. This edition
obsoletes all previous editions.
Manual revised to incorporate ECOs 14513 and 14523.
Manual revised to incorporate ECOs 14519, 14532 and
14594.
Manual revised to incorporate ECOs 14889 and 14885.
Includes C/D models with standard 64K RAM and a
numeric cluster. Incorporates 4 product name change,
change in description of rocket switch 7, clarifica-
tion of communications loopback switch, and removal of
cable 61406110, ECO 14769 changing position of FCC
certification label. Change in table 1-2.
Manual revised to incorporate ECOs 14754, 14840,
14861, 14995, and 15018.
Manual revised to incorporate ECO 15331 and SB05394.
Makes technical additions/corrections.
Manual revised to incorporate ECOs 15634 and 15675.
Manual revised to incorporate ECO 15945.
Address comments concerning
this manual to:
REVISION LETTERS I, 0, Q AND X ARE NOT USED
©1980, 1981, 1982, 1983
by Control Data Corporation
Printed in the United States of America
ii
Control Data Corporation
Publications a·nd Graphics Div.
2401 North Fairview Avenue
St. Paul, Minnesota 55113
or use Comment Sheet in
the back of this manual.

MANUAL TO EQUIPMENT LEVEL CORRELATION SHEET
This manual reflects
the equipment
configurations listed below.
EXPLANATION: Locate the equipment type and series number, as shown
on
the equipment FCO log, in the list below.
Immediately to the right
of
the series number is an FCO number.
If that number and all of the
numbers underneath it match all of the numbers on the equipment FCO
log, then this manual accurately reflects the equipment.
I I I I
I
EQUIPMENT TYPE
SERIES I WITH FCO'S I
COMMENTS
I
I I I I
I I I I
I CC629-A
01
I
14284
Is/N
125
I
I
02
I
14336
Is/N 162
I
I
03
I
IECO 14422
I
I
03
I
IECO
14402
I
I
04
I
IECO 14468
I
I
05
I I !I
I I I I
I I I I
I I I I
I CC629-B
01
I
14284
Is/N
125
I
I
02
I
14336
Is/N
162
I
I
03
I
IECO
14422
I
I
03
I I I
I I I I
I I I I
I I 1 I
I CC629-C
01
I I I
J 1 f I
J I I I
I I I I
I CC629-D
01
I I f
, I I I
I I t I
1 I I I
I XA244-A
01
I J f
I I I I
t 1 I I I
I I I I I
I XA243-A I
01
I I J
I t I I J
I I I I I
I I I , I
I I I I I
I 1 I I I
1 I I 1 I
I I I I I
I I I I t
I I I I I
62940007 H
iii/iv

LIST OF EFFECTIVE PAGES
New features, as well as changes, deletions, and additions to informa-
tion in this manual are indicated by bars in the margins or by a dot
near the page number if the entire page is affected. A bar by the
page number indicates pagination rather than content has changed.
=~=- p~~~=--r~11 -~-=~ __ ~~~r~11 =--==~~;~:=:E
Cover I - 3-16/3-17 I A 15-29 C
Title Page I - 3-18 I B 15-30 A
ii I J 3-19/3-20 I E 15-31 D
iii I H 3-21 I B 15-32 A
iv I E 3-22 I E 15-33 C
v/vi I J 3-23 I B 15-34 B
vii/viii I E 4-1 I E 15-35 thru 5-51 D
ix I B 4-2 B 15-52 thru 5-54 A
x I E 4-3 A 15-55 D
xi I F 4-4 E 15-56 B
xii I E 4-5 A 15-57 A
xiii F 4-6 B 15-58/5-59 D
1-1 E 4-7 A 15-60 A
11-2 thru 1-4 B 4-8 B 15-61 D
11-5 A 4-9 A 115-62 thru 5-67 F
11-6 E 4-10 thru 4-13 B 16-1 A
11-7 thru 1-9 B 4-14 F 16-2 E
11-10 A 4-15/4-16 A 16-3 B
11-11 B 14-17 thru 4-19 B 6-4 A
11-12 E 14-20 A 6-5 thru 6-7 D
11-12.1/1-12.2 F 14-21 thru 4-25 B 6-8 thru 6-14 A
11-13/1-14 B 14-26 thru 4-30 A 6-15 B
11-15 A 14-31/4-32 E 6-16 F
11-16 thru 1-18 A 14-33 B 6-17 thru 6-23 A
12-1 thru 2-3 A 14-34/4-35 A 6-24 thru 6-26 B
12-4/2-5 B 14-36/4-37 B 6-27 thru 6-32 A
12-6 G 14-38 E 6-33 E
12-7/2-8 A 4-39 F 6-34 thru 6-36 A
12-9/2-10 E 5-1 E 6-37 E
12-11 A 5-2/5-3 F 6-38 A
12-12 E 5-4 A 16-39 B I
12-13/2-14 A 5-5 D 6-40 thru 6-44 A I
13-1 B 5-6 A 6-45/6-46 B I
13-2 A 5-7 D 6-47 thru 6-51 A I
13-3 B 5-8/5-9 F 6-52 thru 6-55 B I
13-4 E 5-10 thru 5-12 A 6-56 A I
13-5/3-6 E 5-13 B 6-57 B I
13-7 G 5-14 thru 5-16 A 6-58 thru 6-63 A'I
13-8 E 5-17 D 6-64/6-65 B I
13-9 A 5-18 thru 5-20 A 6-66 A I
13-10 B 5-21 D 6-67 E I
13-11 G 5-22 A 6-68 B I
13-12 E 5-23/5-24 D 6-69 thru 6-71 AI
13-13 A 5-25/5-26 A 6-72 B I
13-14/3-15 E 5-27/5-2~ B 6-73 thru 6-79 A I
62940007 J v

LIST OF EFFECTIVE
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17-10/7-10.1
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17-11 thru 7-21
F
7-22
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7-22.1 thru 7-23
F
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A
7-28/7-29
B
7-30 thru 7-32
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7-32.1 thru 7-32.3
F
7-33/7-34
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E
7-35 thru 7-38
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7-38.1
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7-38.2 thru 7-38.4
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7-44 thru 7-48
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7-53
B I I I I
7-54/7-55
H I 1 I I I
7-56 thru 7-61
B I I f I I
7-62 thru 7-67
H I I I I I
ICononent Sheet
J I I I I I
(Mailer
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vi
62940007 J

PREFACE
This manual contains information for the on-site and support
maintenance of the CDC@ Information Systems Terminal III.
Equipment numbers correlation are as follows:
Equipment
Number Description
CC629-A/C 60-Hz Model
Terminal
XA244-A .Touchpanel
CC629-B/D 50-Hz Model
Terminal
XA244-A
Touchpanel
In addition, the following options may be added to the terminal:
Equipment
Number
XA247-B
XA281-A
YA254-B
Description
Internal Modem for PLATO
Network Communications
Read-Only Memory (ROM)
Expansion with Timeshare
Program
Modem Cable, Part No. 61409153
These options may be added to CC629-A/B and are standard on
CC629-C/D:
XA243-A
YA266-A
16K Random-Access
Memory (RAM) Expansion
Numeric Cluster
The information in this manual is divided into seven sections:
Section 1 - General Description
Section 2 - Operation
Section 3 - Installation and Checkout
Section 4 - Theory of Operation
Section 5 - Diagrams
Section 6 - Maintenance
Section 7 - Parts Data
62940'007 E
vii •

I
Manuals providing additional information on the terminal and
related devices include:
Title
Information Systems Terminal III Operators Guide
PLATO User's Guide
Tutorial Access Service IST III Terminal
User's Guide
40003-208/209 Graphic Printers Operator's Guide/
Reference Manual
CL607-A/B Graphic Printer and XA262-A Printer
Interface Hardware Maintenance Manual
PLATO Flexible Disk Subsystem Hardware Maintenance
Manual
PLATO Flexible Disk Subsystem Operator's Guide
CN70l-A Acoustic Coupler Special Purpose Manual
Control Data 110 Microcomputer System User
Installation and Diagnostics Manual
All manuals may be ordered from:
viii
Control Data Corporation
Literature and Distribution Services
308 North Dale Street
St. Paul, Minneso~a 55103
Publication
Number
62940006
97405900
84001740
62949200
62949900
62949100
62940005
62945100
62940024
62940007 E

CONTENTS
1. GENERAL DESCRIPTION
Func t ions • • • • • • • • • • • • • • • • • • • • • •
Online Characteristics in PLATO Network • • • • •
Online Characteristics in Data Services Network
Major Assemblies ••••• • 0 • • • 0 • • • • • • •
Display Monitor 0.. 0 0 • • 0 • •• • 0 • •
Operator Panel 0 • • • 0 0 • 0 • • • • • • 0 0
Touchpanel • • 0 • • 0 • • ••
Keyboard • • • • ••• 0 • • 0 o. • 0 • •
Enclosure ••• o. o. • 0 • • • • • • 0 0 •
Controller Board • • • • 0 • • • • •• ••••
Video Board ••••••••• 0 • • • • • • •
Optional Modem/DAA Board (PLATO Network Use Only).
Power Supply • 0 • • • • • • • • • • • • • 0 •
External Interfaces • 0 0 0 • • • • • 0 •• •••
Phone/Line • • • • • • • • • • • • • • • 0 • • • •
Video Out • • • ••• 0 0 • 0 0 • • • • • • •
Serial . . . . . . . . . . . . . . . .
ASCII/PLATO Comm (Communications) ••• 0 ••
Characteristics with an ASCII Network •
Characteristics with PLATO Network • • • • • •
Parallel • • • • • • • • • • • • 0 • •
Equipment Specifications ••••••••••• • • •
Physical Specifications •••• o. • ••
Electrical Specifications •• • 0 • • • 0 • 0 • •
Environmental Specifications •••••••••
I/O Cable, Grounding, and Tool Requirements 0 0 •••
I/O Cables • • • • • • 0 • • • • • • • • • • •
Grounding • • • • • 0 • 0 • • • • • • • •
Tool s . . . . . • . . . . . . . . ..... .
2. OPERATION
External Controls and Indicators • • 0 • • 0 • • 0 •
Keyboard • • • • • • • • • • • • • • • •• ••
On/Off Circuit Breaker • • • • • • • • • • • • • •
Brightness Control • • 0 • 0 • 0 0 • • • • 0 • • •
TALK/DATA Switch • • • • • • • • • • • 0 • 0 •
RESET Switch • 0 • • • • • • • • • • .0 • 0 • • •
Selection Switches Behind Protective Door 0 • • •
Light-Emitting Diodes (LEDS) 0 • • ••••
Internal Controls and Indicators • • • • • • • • • •
Communications Loopback Switch • • • • • • • • • •
Refresh Memory Write Switch • • 0 • • • • • • • •
Flood Screen Switch • 0 • 0 , 0 • • 0 • 0 • • • •
S2, S5, and ROM Selection Switches •••• 0 •••
Display Board Controls • • • • • •.• 0 0 • • • • •
Power-Supply Board Controls and Indicators • • • •
62940007 B
1-1
1-2
1-3
1-4
1-4
1-4
1-5
1-5
1-6
1-6
1-6
1-7
1-8
1-8
1-8
1-9
1-9
1-11
1-11
1-13
1-14
1-16
1-16
1-16
1-16
1-17
1-17
1-17
1-17
2-1
2-2
2-2
2-2
2-2
2-3
2-4
2-8
2-8
2-10
2-10
2-10
2-11
2-14
2-14
ix

3. INSTALLATION AND CHECKOUT
Crating . . . . . . . . . . .. ...
Uncrating • • • • • • • • • • • • • •
Installation • • • • • • • • • •
Preparing Terminal • • • • • • • • • • • •
Installing Options • • • • • • • •
Installing RAM Expansion Option • •
Installing ROM/EROM Expansion Option • • •
Installing Internal Modem/DAA Option • • •
Installing Cabling • • • • • • • • • • • • • •
Communications Via External Modern • • •
Communications Via Internal Modern • • • • •
Communications Via Internal/External Modern
Communications Via Long-Line Rec~iver/Driver
. .
Setting Internal Switches • •• •••••••
Checkout • • • • • • • • • • • • . • • . • . • • • •
4. THEORY OF OPERATION
Controller • • • • • • • • • • • • • •
Microprocessor • •• • • • •
Read/Write Memory Transfers • ••• • • • •
Instruction Fetching • • • • • • • •
Instructed Reads and Writes • • • •
Input/Output Functions • • • • • • • • • • • •
Input 0016 - Read Maintenance and Load
Switches . . . . . . . . . . . . . . .
Output 00
16
- Lo~d Maintenance Register
Input 01
16
- Read Keyboard Data ••••
Output 0116 - Load PLATO Transmitter Lower
Bi ts . . . . . . . . . . . . . . . . . . .
Input 02
16 -
Read Touchpane1 Data • • • •
Output 0216 - Load PLATO Transmitter Upper
Bi ts . . . . . . . . . . .. .. . . .
Input 0316 - Read Lower ID • • • • • • .
Output 0316 - Bulk Write/Erase and Video
Enable/Disable • • • • • • • • . • • • • •
Input 0416 - Read Upper ID • • • • • • • • •
Output 0416 - Load.lnterrupt Mask •••
Input 05
16 -
Read Internal Switches
Output 0516 - Miscellaneous Control • •
Input 0616 - Read Communication Switches
and Status • • • • • • • • • • • • • •
Output 0616 - Load ASCII Communication
Data Rates • • • • • • • • • • • • • •
Input 0716 _ Read Controller Status
Output 0716 - Load Serial I/O Data Rate • •
Input 0816 - Read PLATO Communication Data •
Input 1016 - Read ASCII Communication Data •
Output 1016 - Load ASCII Communication Data.
Input 1116 - Read ASCII Communication Status
3-1
3-1
3-3
3-3
3-3
3-4
3-6
3-7
3-11
3-11
3-13
3-14
3-16
3-16
3-21
4-2
4-3
4-4
4-4
4-4
4-5
4-6
4-6
4-7
4-8
4-8
4-8
4-9
4-9
4-10
4-10
4-11
4-12
4-13
4-14
4-16
4-17
4-18
4-18
4-19
4-19
x
62940007 E

Output 1116 - Load ASCII Communication
Control • • • • • • • • • • • • . . .
Input 12
16
- Read Serial I/O Data
Output 1216 - Load Serial I/O Data • • • • •
Input 13
16 -
Read Serial I/O Status
Output 1316 - Load Serial I/O Control •••
Input 2Y/3Y16 - Input from Parallel Channel.
Output 2Y/3Y16 - Output to Parallel Channel.
PLATO Communication Circuits • • • • • • • • • • •
PLATO Receiver ••• • • • • • • • • • • • • •
Word Detection • ••••••
Word Assembly • • • • • • • • •
PLATO Transmitter • • • • • • • •• ••••
Word Transfer/Serialization ••••••••
Word Formatting • • • • • • • • • •
ASCII Communication Circuits • • • • • • • • • • •
ASCII Receiver • • • •• •••••••••
ASCII Transmitter • • • • •• •••••••
Serial Interface Circuits • • • • • •• •••
Parallel Interface Circuits • • • • • • •
Interface Signals • • • • • • • • • • • • • • •
Timing .. . . .. .. . . . . . . . . . .
Output Exchange • • • • • •• •••
Input Exchange •••• •••••••
Video Board . . . .. ......... . . . . •
Memory Structure • • • • • • • • • • • • • • • • •
Program Memory • •• •••••••••••
Display-Refresh Memory • •• •••••••
Display Refresh • • • • • • • • • • • • • • • • •
Refresh-Memory/Display Relationship • • • •
Display-Refresh Timing • • • • • • • • ••
Optional Modem/DAA Board (PLATO Network Use Only)
Operator Panel • • • • • • •• •••••••••
Touchpanel •• •••••• •••••
Keyboard • •• •••• ••• • • • • • • • •
Numeric Cluster •••••••••• •••
Display Monitor • •• • •••••••••••••
Power Supply Board •• • • • • • • • • • • • • •
5. DIAGRAMS
Logic Diagram Set Contents Sheet • • • • • • • •
Schematic Diagram, lAGD (ASCII 1st Power Supply)
6. MAINTENANCE
Suggested Emergency Maintenance Procedure • • • • • •
Before Leaving for Customer Site •••
Upon Arriving at Customer Site ••••••••
Maintenance Aids ••••••••••••••••••
Resident Diagnostics • • • • •• •••••••
62940007 F
RAM Tests • • • • • • • • • • • •
Interface Tests • • • • • • • • •
PLATO Communications Test
· . . . . . .
· . . . .
· . . . .
4-19
4-19
4-19
4-20
4-20
4-20
4-20
4-20
4-20
4-21
4-21
4-22
4-22
4-23
4-23
4-24
4-25
4-25
4-26
4-26
4-27
4-27
4-30
4-31
4-31
4-32
4-32
4-32
4-32
4-34
4-35
4-36
4-36
4-37
4-38
4-39
4-39
5-2
5-65
6-1
6-1
6-2
6-3
6-3
6-3
6-4
6-4
xi
I
I

ASCII Communications and SERIAL-Interface
Communications Tests • • • • • • • • • • •
CRT Alignment, Touchpanel, and Keyboard Tests.
PLATO System Diagnostic (DIAG) • • • • • • • • • •
Preventive Maintenance ••• • •• •••••• •
Special Tools and Test Equipment • • • • • • • • • •
MOS Circuit Handling Precautions • • • • • • • •
Diagnostic and Corrective Maintenance Procedures
SAM Format • • • •• •••••••
. .
Use of SAMs • • • • • • • • • • • • • • • • • • •
Organization of SAMs and Procedures •• • • •
Procedure 1 - Turning Terminal On/Off • • •
Procedure 2 - Executing Resident Diagnostics
Procedure 3 - Removing Hood and Bezel • • • • •
Procedure 4 - Adjusting Video • • • • • • • • •
Procedure 5 - Adjustment Yoke Centering Rings •
Procedure 6 - Replacing Video • • • • • • •
Procedure 7 - Replacing Controller Board •• •
Procedure 8 - Replacing Integrated-Circuit
Ch ips . . . . . . . . . . . . . . . . . . . .
Procedure 9 - Checking and Adjusting Power
Supply Voltages •••••••••••••
Procedure 10 - Replacing Power Supply Board • •
Procedure 11 - Replacing Line Filter, Power-Cord
Receptacle, and Stepdown Transformer ••••
Procedure 12 - Replacing ON/OFF Circuit
Breaker • • • • • • • • • • • • . . . . . . .
Procedure 13 - Replacing Keyboard Assembly and
Components •••• • • • • • • • • • • • • •
Procedure 14 - Replacing Operator Panel • • • •
Procedure 15 - Replacing Operator Panel LEDs
Procedure 16 - Replacing BRIGHTNESS Control • •
Procedure 17 - Replacing Protective Door •••
Procedure 18 - Replacing Matched Yoke/CRT or
Display Board • • • • ',. • • • • • • • • • •
Procedure 19 - Replacing Voltage Doubler/
Bleeder Assembly • • • • • • • • • • • •
Procedure 20 - Replacing Touchpanel • • • •
Procedure 21 - Replacing Internal Modem Board •
Procedure 22 - Defining Acceptable Display
Quality .................. .
Procedure 23 - Installing Numeric Cluster •
7. PARTS DATA
Genealogy IST-III 50 & 60 Hz • • • • • • • • • • • •
Genealogy CDllO IST III 50 & 60 Hz • • • • • ••
Spare Parts List ASCII IST-II Basic Terminal • • • •
Spare Parts List Touch Panel Option • • • • • • •
Spare Parts List PLATO Communication Network Modem
Spare Parts List Memory Expansion Option • • • • • •
Spare Parts List Timeshare ROM Option • • • • • • • •
Spare Parts List Numeric Cluster Option • • • • •
6-4
6-5
6-5
6-6
6-7
6-7
6-8
6-8
6-9
6-10
6-37
6-37
6-42
6-45
6-49
6-50
6-52
6-54
6-58
6-61
6-63
6-66
6-67
6-70
6-71
6-72
6-73
6-73
6-76
6-76
6-79
6-79
6-80
7-3
7-4
7-4.1
7-6
7-7
7-8
7-9
7--10
xii
62940007 E

Keycap Set, Numer ic Cl uster • • • • • • • • • • • • •
ASCII Terminal 60 Hz TLA • • • • • • • • • • • • • •
ASCII Terminal 50 Hz TLA • • • • • • • • • • • • • •
Panel & Gasket Assembly • • • • • • • • • • • • • • •
CDllO ASCII Terminal 60 Hz TLA • • • • • • • • • • •
CDllO ASCII Terminal 50 Hz TLA • • • • • • • • • • •
A. C. Entry Assy • • • • • • • • • • • • • • • • • • •
P.C. Card Assembly, OADD Operator Panel (2nd
Generation) • • • • • • • 0 • 0 0 0 • • 0 0 0 • • 0
Card Assembly OABD Video Cont Module W/Firmware 0 • •
P.C. Card Assembly OABD, Video Controller • • • • • •
PoCo
Card Assembly OABD, Video Controller W/Firmware
P.C. Card Asembly, OACD Controller Module • • 0 0 • •
P.C. Card Assembly, 8CHD (Modern 150/1200 BPS) • 0 ••
P.C. Card Assembly, OAGD Modern Line Filter •• • 0 •
P.C. Card Asembly, 9CAD ASCII 1ST Power Supply • 0 •
P.C. Card Assembly, lAGD ASCII 1st Power Supply • • 0
Cable Assy Data Set • • • • 0 • • • • • 0 0 • 0 0 • •
Cable, Display Logic ••••• 0 0 • 0 0 • • • • 0 •
Cable Assy-Power Conn 0 0 • 0 • • 0 • 0 0 • 0 • 0 • •
Cable Assy-DC Power • 0 • 0 • • • • 0 • 0 • • 0 • • •
Cable Assy-Logic Signals 0 0 0 • • 0 • • • 0 • 0 • '.
Cable Assy-Video Output • • • • • • 0 • 0 • 0 0 • • •
Cable Assy-AC Input 0 0 • 0 • • • 0 • • 0 • • • • • •
Cable Assy-AC Entry, 60 Hz •• • • • • • • 0 • •
Cab2e Assy-AC Entry, 50 Hz 0..... . 0. . . . .
FIGURES
1. GENERAL DESCRIPTION
1-1
Terminal
Configured
in
PLATO
Network
· • • • ·
1-2 Terminal
Configured
in
Data Services
Network
•
1-3
Terminal
• • • • 0 · • · · . • • • 0 • 0 • • 0
1-4
External Interface
Connectors
• • 0 • • • • • •
1-5
Serial
Word
Format
· · · · . · ·
. . · • · · · ·
1-6
Receive Word
Format
in
PLATO
Network
0 • • • •
1-7
Transmit Word
Format
in
PLATO
Network
• • • 0 0
2. OPERATION
2-1
External
Controls and Indicators ,0
• · 0 · 0 0
2-2
Selection Switches Behind Protective
Door
• • •
2-3
Internal
Controls and
Indicators . • • • 0 • ·
2-4
Decal-Inside Hood
• • • · • 0 • • 0 0 0 • 0 0 •
2-5
Power-Supply Board Controls
and Indicators
· •
3. INSTALLATION AND CHECKOUT
7-10.1
7-10.2
7-16
7-22
7-22.2
7-22.7
7-24
7-26
7-28
7-30
7-32.2
7-34
7-40
7-44
7-46
7-48.2
7-50.2
7-52.2
7-54
7-56
7-58
7-60
7-62
7-64
7-66
1-2
1-3
1-5
1-8
1-10
1-13
1-14
2-1
2--5
2-9
2-11
2-14
3-1 Terminal Packaging • • 0 • • 0 0 0 • 0 0 • •• 3-2
3-2 Video Board Locations for RAM Expansion • • • 0 3~5
62940007 F
xiii
I
I
I

3-3 Equipment Identification Label and FCO Log
Placement for Memory Expansion Options • • •
3-4 Video Board Locations for ROM/EROMExpansion •
3-5 Internal Modem/DAA Installation • • • • • • • •
3-6 Modem Shield and Board Installation • • • • • •
3-7 Communications Via External Modem • • • • • • •
3-8 Communications Via Internal Modem • • • • • • •
3-9 Communications Via Internal/External-Modem
Combination (2.sheets) •••••••••••
3-10 Communications Via Long-Line Receiver/Driver •
3-11 Communications Loopback Switch • • • • • • • •
4. THEORY OF OPERATION
4-1
4-2
4-2.1
4-3
4-4
4-5
4-6
4-7
4-8
4-9
Terminal Block Diagram • • • • • • • • • •
Data Bus Word for Input 0216 •••••••••
Significance of S5 Switches ••••••••
PLATO Receive Word Format • • • • • • • • • • •
Receive PLATO Word Transfer • • • • • • • • • •
Transmit PLATO Word Transfer • • • • • • • • •
PLATO Transmit Word Format • • • • • • • • • •
ASCII Receiver Word Format • • • • • • • • • •
ASCII Transmitter Word Format • • • • • • • • •
External Input/Output Timing (No Extra Wait
States) •••••••••••••••••
4-10 External Input/Output Timing with Delayed
Device Ready (Extra Wait States) ••••••
4-11 External Input/Output Timing with Device Not
Ready (Timeout) •• .. • • • • • • • • • • • •
4-12 Memory Structure and Address Assignments • • •
4-13 Refresh-Memory/Display Relationship • • • • • •
4-14 Scan Line Timing (Composite Video Signal) •••
4-15 Frame Timing (Composite Video Signal) •••••
4-16 Keyboard Codes and Legends • • • • • • • • • •
4-16.1 Keyboard with Numeric Cluster • • • • ••
6. MAINTENANCE
6-1
Example
ofa
SAM
• • • • • • • • · • • • • • •
6-2 Organization
of SAMs and Corrective Maintenance
Procedures
• • • 0 0 • • 0 • • 0 • • • •
6-3 Keyboard
Codes and Legends
• · • • • 0 • • • •
6-4
RAM
Chip Location
• 0 0 · • • 0 · · • • • ·
6-5
Hood Removal
0 • • • 0 • • •
o·
0 • • • • • • 0
6-6
Bottom
of Terminal
• • 0 0 • • • • 0 0
-0
0 • •
6-7 Bracket
Screws Removal
• • • • 0 0 • •
.•
·
6-8 Display Board • • • • · 0 • • • • · • • • • 0 •
6-9 CRT
Centering Rings
• • · · • • · • · · · • • •
6-10
Video
and
Controller
Board
Locations
• · • • •
6-11 Video
Board
• • · • · • • • • • • • • • • · • •
6-12
Controller
Board
• · · • • • · • 0 • ·
6-13
Pluggable
Chips
on Controller
Board
· · • • • •
6-14
Pluggable
Chips
on
Video Board
• · • • 0 • • •
3-5
3-7
3 .... 8
3-10
3-12 .
3-13
3-14
3-17
3-20
4-1
4-8
4-11
4-21
4-22
4-23
4-23
4-24
4-25
4-28
4-29
4-30
4-31
4-33
4-34
4-35
4-37
4-38
6-9
6-10
6-39
6-42
6-43
6-43
6-44
6-48
6-49
6-51
6-52
6-54
6-56
6-57
xi~ 62~40007 E

6-15
Pluggable
Chip on
Monitor Display Board
· · · ·
6-16
Test
Points
for +5 V and -12
V Controller
Board
6-17 Power
Supply Board Adjustments
· · · · • · · ·
6-18 Test Points for
+55 V on
Display Board
· · · ·
6-19 Test
Points
for
-5
V and +12
V on Video Board
·
6-20 Monitor Chassis Removal
· · · · · · · · · · · ·
6-21 Power
Supply Board
Removal
· · · · · • • · · ·
6-22 AC Entry
Panel Removal
· • · · · · · · · ·
6-23
Stepdown
Transformer
Removal
(Applicable Only
to
International Units)
· · · · · · · · ·
6-24 ON/OFF
Circuit
Breaker Replacement
• · · · • ·
6-25
Keyboard
Assembly Removal
· · · · · · · · ·
6-26 Keyswitch
Replacement
. · · · · · · · · · · • ·
6-27 Operator Panel
Removal
• · · · · · · · · · · ·
6-28 LEOs
on Operator
Panel
• · · · · · · · · · · ·
6-29
CRT Removal
. . . • . · · · · · · · · · · ·
6-30 Front
Chassis
View
• · · · · · · · · ·
6-31 Touchpanel Removal
· · · · · · · · · ·
6-32
Touchpanel Alignment
Marks
· · · · · • · · · ·
6-33
Orthogonality
and Linearity of Alignment
Pattern
6-34
Numeric Cluster
on Keyboard
· · · · · · · · · ·
TABLES
1. GENERAL DESCRIPTION
1-1
1-2
1-3
1-4
Serial Connector Pin Assignments •• • • •
ASCII/PLATO Corom Connector Pin Assignments
Parallel Connector Pin Assignments • • • • • •
Terminal I/O Cables • • • • • • • • • • • •
2. OPERATION
2-1
2-2
2-3
2-4
2-5
Function of Switches Behind Door •••••••
Load Switch Selections ••••••••••••
Meaning of LEOs During Normal Operation • • • •
Function of Internal Selection Switches • • • •
Interface Signals Affected by Switch S2-7 •••
3. INSTALLATION AND CHECKOUT
3-1
3-2
Setting S2 and S5 Selection Switches
Setting Selection Switches Behind Door
4. THEORY OF OPERATION
4-1
4-2
6~940007 E
Input/Output Functions •••
Data Bus Word for Input 0016
· . .
· . . . . . .
6-57
6-58
6-59
6-60
6-61
6-62
6-63
6-64
6-66
6-67
6-68
6-69
6-70
6-71
6-74
6-75
6-77
6-78
6-80
6-81
1-10
1-12
1-15
1-17
2-5
2-7
2-8
2-12
2-13
3-18
3-22
4-5
4-6
xv
I

4-3
Data Bus Word for Output
0016 • • • • • • • • •
4-7
4-4
Bulk Write/Erase
and Video Enable/Disable
Function
• • •
""
• • • • • • • • • • • • • •
4-9
4-5
Masked Interrupt Conditions
• · • • • • • • • •
4-10
4-6
.. Data
Bus Word for Output
05
16
• · • • · • • • •
4-12
4-7 Data Bus Word for Input
06
16
• • • • • • • • •
4-14
4-8
ASCII Receive Data Rate
Selection
· • • • • • •
4-15
4-9
ASCII
Transmit Data Rate
Selection
• • • • • ·
4-16
4-10
Data Bus Word
for
Input
07
16
• • • • • • • • •
4-17
4-11 Serial
Interface Data Rate
Selection
• · • · ·
4-18
6. MAINTENANCE
6-1 Second Indications for Errors 03, 04, and 05 • 6-40
6-2 Video Adjustment Controls • • • • • • • • • • • 6-46
7. PARTS DATA
7-1
xvi
Explanation of Column Headings of Computer-
Generated Assembly Parts Lists • • • • • • • 7-1
62940007 E

GENERAL DESCRIPTION
This section describes the functions, major assemblies, external
interfaces, and equipment specifications of the terminal, as
,,,,ell as its I/O cable, grounding, and tool requirements.
FUNCTIONS
The terminal is a controlware-driven, graphic/alphanumeric dis-
play device that can operate in either the CDC@ Data Services
Network or the CDC@ PLATO Education Network.* In addition,
timeshare-mode controlware available from the Data Services
network gives the terminal the capability to operate in other
networks that use ASCII coded communications.** This can also
be accomplished without accessing the Data Services network if
the terminal is configured with a local controlware source (a
flexible disk drive or additional ROM/EROM containing resident
controlware).
Controlware instructions establish all functional characteris-
tics of the terminal. The terminal automatically loads these
instructions following a power on. This occurs after the load
source has been selected, and if applicable, after network
communications has been established. Depending on the setting
of switches on the terminal, the load source may either be
selected automatically or be selected manually through keyboard
or touchpanel entries. The possible load sources are:
• PLATO host computer - downline loads PLATO network
controlware.
• Data Services host computer - downline loads an ASCII
version of PLATO controlware, controlware for graphics
mode, and controlware for timeshare mode.
• Flexible disk - loads directly from an associated
flexible disk drive.***
• Internal ROM/EROM - loads from optional ROM/EROM within
the terminal.
*PLATO is an acronym for Programmed Logic for Automated
Teaching Operations.
**ASCII is an abbreviation of American Standard Code for Infor-
mation Interchange, which is the type of coding used by the
Data Services network.
***Loading from flexible disk requires 16K of additional RAM in
CC629-A/B.
62940007 E
1-1
I