Texas Instruments 990 Maintenance Manual page 3

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945407-9701
PREFACE
This manual provides maintenance instructions for the Texas Instruments 16 Input/ 16 Output
TTL Data Module. The manual also provides the theory of operation for the module. The
information in the manual is divided into the following sections:
I. General Description - This section briefly describes the module, including its operation
and characteristics.
II. Installation - This section provides instructions for unpacking, inspecting, and
installing the module into a Model 990 Computer mainframe or expansion chassis.
III. Operating Instructions - This section provides programming instructions for the
module and a description of how the software controls the operation of the module.
IV. Theory of Operation - This section contains detailed block diagrams of the data
module, describes the module's interfaces with the Model 990 Computer and a
peripheral device, and provides a discussion of the module's operation.
V. Maintenance - This section provides troubleshooting and fault isolation procedures for
the module.
Alphabetical Index - The alphabetical index provides an alphabetical listing of key
words and concepts within the manual and locates them for easy reference.
Additional information related to the 16 Input/16 Output TTL Data Module may be found in
the following documents:
Title
990 Computer Family Systems Handbook
Model 990/4 Computer System Hardware Reference
Manual
Model 990/ 10 Computer System Hardware Reference
Manual
Model 990 Computer Family Maintenance Drawings
iii/iv
Part Number
945250-9701
945251-9701
945417-9701
945421-9701
and
945421-9702
Digital Systems Division