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Texas Instruments 990 Manual
Video display terminal
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Also See for 990
:
Operation manual
(276 pages)
,
User manual
(274 pages)
,
Installation and operation manual
(122 pages)
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Contents
Table of Contents
Table of Contents
Table of Contents
Paragraph Title Page
Section I. Theory of Operation
General
System Description
CRT Monitor
Power/Logic PWB
VDT Controller
Interface Descriptions
VDT Controller/Computer Interface
Single-Bit Operations
Multiple-Bit Operations
Hardware Interface Signals
Keyboard Data (KBDT, 1-8)
Keyboard Data Strobe (KBSIN-)
Power/Logic PWB-To-VDT Controller Interface
Keyboard Data (TET,1,2,T)
Terminal Ready (TRD, 1, 2, T)
VDT Controller-To-Power/Logic PWB Interface
Beep Enable (BET, 1, 2, T)
Modem Audio (MODIN)
Principles of Operation
Mode Keys and Mode Select Logic
Power/Logic PWB
Buffer Register
LED Display
Difference Amplifier
CRT Monitor
CRT Interface Logic
Built-In Test Logic
Keyboard Logic
Model 911 VDT Controller Block Diagram
Video Line Driver
CRU Interface Logic
Model 911 VDT Keyboard Logic
CRU Interface Logic
Refresh Memory and Control Logic
Refresh Memory Block Diagram
Refresh Memory Data Path
Memory Read and Write Control Logic
Memory Addressing Logic
Flowchart for Memory Write Operation
Flowchart for Memory Read Operation
Display Screen Refresh Cycle Flowchart
Video Output Logic
Model 911 VDT Character Matrix Formats
Model 911 VDT Displayed United States Character Set, Including Graphics Symbols
Model 911 VDT Alarm Logic
Model 911 VDT Time Base Generator Character Synchronization Logic
Model 911 VDT Dot Counter Outputs
Model 911 VDT Sync Timing Diagram
Section II. Maintenance
General
Maintenance Philosophy
Special Test Equipment
Model 990 Computer Hot Mock-Up System for 60-Hertz Model 911 VDT Testing
Hot Mock-Up System
Loading the Diagnostic
Using the Diagnostic
CD Verb Entry
General Maintenance Procedures
PWB Preliminary Checkout
General Fault Isolation Procedures
Keyboard Maintenance Procedures
Keyboard Preliminary Checkout
Keyboard Fault Isolation Procedures
Keyboard Operational Checkout
Power/Logic PWB Maintenance Procedures
Power/Logic PWB Preliminary Checkout
Power/Logic PWB Fault Isolation Procedures
VDT Controller Maintenance Procedures
VDT Controller Fault Isolation Procedures
CRT Monitor Maintenance Procedures
CRT Monitor Preliminary Checkout
CRT Monitor Fault Isolation Procedures
VDT Controller Assembly Configuration
CRU Interface Waveforms During Exercise by the CD-C Verb
Timer Signal Relationships
Alarm Signal Timing Diagram
Model 911 VDT Controller Keyboard Logic Timing Diagram
United Kingdom Model 911 VDT Keyboard Arrangement, Hexadecimal Codes, Mode Character Positions, ASCII, Special Character Set, and Matrix Chart
United Kingdom Model 911 VDT Keyboard Matrix Chart
French Model 911 VDT Keyboard Arrangement, Hexadecimal Codes, Mode Character Positions, ASCII, Special Character Set, and Matrix Chart
Quick Links
Model 990 Computer
Model 911 Video Display Terminal
Depot Maintenance Manual
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Part No. 945424-9701
1 February 1979
TEXAS INSTRUMENTS
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