Service Manuals, User Guides, Schematic Diagrams or docs for : IBM 370 fe 3145 SY24-3581-1_3145_Processing_Unit_Theory-Maintenance_Oct71

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- - Processing Unit
Theory - Maintenance

SY24-3581-1
PREFACE

This manual is for readers who understand the basic concepts of (30 through 33). The contents of each volume is identified on
computers and system programming. Introductory information the accompanying red MOM tab.
that describes data formats, instruction formats, status switching, Because this manual is split into four parts, the index is in the
and program interrupts is in IBM System/360 Principles of front of the manual. The index,which effectively points to
Operation, GA22-6821; and IBM System/370 Principles of the places where information exists, follows the chart showing
Operation, GA22-7000. the major areas of each chapter. Each chapter contains its own
Integrated graphic techniques are used where practical to contents. This makes it unnecessary to refer back to Volume 30
provide standalone diagrams and modular units of information. whenever you are looking for specific information within a
The information ranges from basic system concepts, contained particular chapter.
in Chapter 1, to the detailed operations of a functional unit or
area contained in Chapters 2-13. Each chapter contains a modular This manual references diagrams in the 3145 Processing Unit,
segment of information about a major functional area of the Maintenance Diagrams, SY24-3580.
system, such as CPU, storage and console. Other related manuals are:
This manual also contains information to be used in maintaining IBM System/370 Model 145 Functional Characteristics,
or repairing the 3145. It also includes CPU reference data; GA24-3557
channel reference data; maintenance techniques; checks, adjust- IBM System/370 Model 145 Operating Procedures, C38-0015
ments, and removal procedures, power and cooling maintenance IBM System/370 Model 145 Channel Characteristics,
procedures; physical locations; description of panel indicators. GA24-3573
The 370 Microprogram Listing contains the microinstruction IBM System/370 Model 145 Installation Information-Physical
sequences required to execute any program instruction. There- Planning, GA22-6976
fore, the execution of only some of the program instructions is IBM System/370 System Summary, GA22-7001
described in this manual. Instead, certain representative IBM FE Theory of Operation, Component Circuits, SLT,
examples are described, using flow charts and example operands. SLD, ASL T, MST, SY22-2798
The examples show microprogram sequences and data paths IBM FE Theory of Operation, Power Supplies, SL T, SLD,
required to execute the instruction. ASLT, MST, SY22-2799
The 3145 Theory-Maintenance manual shipped as part of the IBM FE Theory of Operation, Monolithic System Technology,
maintenance package for the system is contained in four volumes Packaging Tools, Wiring Change Procedures, SY22-6739

Second Edition (October 1971)

This edition (SY24-3581-1) is a major revision of, and obsoletes SY24-3581-0.
This publication has been revised completely with major additions, deletions, and
reformatting of existing material. For this reason, the reader should review this
edition in its entirety.

Significant changes and additions to the information contained in this publication arc
continually being made: any such changes will be in subsequent revisions or Technical
Newsletters.

Request for copies of IBM publications should be made to your IBM representative
or to the IBM branch office serving your locality.

This manual has been prepared by the IBM Systems Development Division, Product
Publications, Dept. KIO, P.O. Box 6, Endicott, N.Y. 13760. To help us evaluate
this manual, you arc encouraged to use the Reader's Comment Form in the back of
this manual. Your comments will help to provide better documentation in both this
manual and future manuals. If the form has been removed, comments may be sent
to the above address. Comments become the property of IBM.

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