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Form Y28-660S-2




Program Logic




IBM System/360 Operating System
Introduction to Control Program Logic



Program Number 3605-CI-505
3605-DM-50B

This publication discusses the compo-
nents of the primary control program of IBM
System/360 Operating System and indicates
the program logic manuals that describe
these components.
Program Logic Manuals are intended for
use ny IBM customer engineers involved in
program maintenance, and by system program-
mers involved in altering the program
design. Program logic information is not
necessary for program operation and use;
therefore, distribution of this manual is
limited to persons with program maintenance
or modification responsibilities.




RESTRICTED DISTRIBUTION
,PREFACE




This publication is an introduction to
the logic of the primary control program
and to the program logic manuals that
describe its components. The figures that
trace the flow of CPU control for varfous
operations are examples of typical uses of
control program facilities.

Before using this publication, the read-
er should be familiar with the contents of:
IBM System/360 Operating System: Intro-
duction, Form C28-6534
IBM Systern/360 Operating System: Con-
cepts and Facilities, Form C28-6535

IBM Systern/360: Principles of Operation,
Form A22-6821




Major Revision (September 1966)
This edition, Form Y28-6605-2, is a major reV1S10n of and obsoletes
Forms Y28-6605-0 and -1. The system control blocks that were formally
in Part II of this publication have been deleted and are now in the
publication IBM System/360 Operating System: System Control Blocks,
Form C28-6628.


This publication was prepared for production using an IBM computer to
update the text and to control the page and line format. Page
impressions for photo-offset printing were obtained from an IBM 1403
Printer using a special print chain.
Requests for copies of IBM publications should be made to your IBM
representative or to the IBM branch office serving your locality.
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, Programming Systems Publications, Department D58,
PO Box 390, Poughkeepsie, N. Y. 12602