Service Manuals, User Guides, Schematic Diagrams or docs for : IBM 360 fe 2020 Z33-1021-0_2020_Processing_Unit_FETOM_May68

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                            ll) g5~            Field Engineering

                                               Theory of Operation




                            IBM Confidential




~ @~ @ Processing                Unit

System/360 Model 20
(Machines with serial no. 50,000 and above)




                                                                   Z33-1021-0
Preface




This manual describes the IBM 2020 Central Processing
Unit for the IBM System/360 Model 20 (Machines with
serial no. 50,000 and above). It also defines the relationship
of the 2020 Processing Unit to the System/360 Model 20 and
to the input/output devices to which it may be connected.
  Field Engineering Maintenance Diagrams manual, 2020
Processing Unit, System/360 Model 20 (Machines with
serial no. 50,000 and above), Form Z33-1024-O is
complementary to this manual and is referenced in the
text as "FEMDM".




First Edition

This manual contains preliminary information and is subject to change without further notice.



A form is provided at the back of this publication for reader's comments. If the form has been removed, comments may be
addressed to IBM Corporation, 112 East Post Road, White Plains, N.Y. 10601, for the attention of Publishing Operations.



ii
                                                                                                                 Contents




Chapter 1. Introduction                               1- 1      Local Store (LS)                                      1-35
IBM System/360 Model 20                               1- 1      Modify Address

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