Texas Instruments 990 Manual page 3

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945424-9701
PREFACE
This manual provides maintenance instructions for the United States, European, and Japanese
versions of the Texas Instruments Model 911 Video Display Terminal. It also provides theory of
operation for the terminal. The manual consists of two sections and six appendixes:
I Theory of Operation - This section contains a detailed block diagram description of the
Model 911 Video Display Terminal, describes the terminal's interfaces with the Model
990 Computer, and provides a discussion of the terminal's operation.
II Maintenance - This section provides troubleshooting and fault isolation procedures for
the terminal.
A. United Kingdom Model - This appendix describes the United Kingdom version of the
911 Video Display Terminal (VDT) keyboard, including codes, modes, matrix, and
special character set produced by it.
B. French Model - This appendix illustrates the French version of the 911 VDT keyboard,
including codes, modes, matrix, and special character set produced by it.
C. German Model - This appendix illustrates the German version of the 911 VDT key-
board, including codes, modes, matrix, and special character set produced by it.
D. Swedish/Finnish Model - This appendix illustrates the Swedish/Finnish version of the
911 VDT keyboard, including codes, modes, matrix, and special character set produced
by it.
E. Norwegian/Danish Model - This appendix illustrates the Norwegian/Danish version of
the 911 VDT keyboard, including codes, modes, matrix, and special character set pro-
duced by it.
F. Japanese Katakana Model - This appendix illustrates the Japanese Katakana keyboard,
including codes, modes, matrix, special character set, keyboard logic, and additional
128 eight-bit displayed character set produced by it.
Additional information related to the Model 911 Video Display Terminal may be found in the
following documents:
Title
990 Computer Family Systems Handbook
Model 990/4 Computer System Depot
Maintenance Manual
Model 990/10 Computer System Depot
Maintenance Manual
iii
Part Number
945250-9701
945403-9701
945404-9701
Digital Systems Division