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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