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File Number 8360-36
Form Y24-5017-2

Program Logic

IBM System/360
Disk Operating System
System Control
Program Logic Manual
PrDgram Number 360N-CL-453, Version 2

This publication describes the internal logic of
the IBM Systeml360 Disk Operating System, System
Control Program. It is intended for use by
persons involved in program maintenance and by
system programmers who are altering the program
design. Program logic information is not
necessary for the operation of the System Control
Program; therefore, distribution of this
publi~ation is limited to those with maintenance
and alteration requirements. It is designed to be
used as a supplement to the program listing.

Effective use of this manual requires an
understanding of IBM System/360 operation and of
IBM System/360 Disk Operating System control and
service programs, macro instructions, an"d
operating procedures. Reference Publications for
this information are listed in the Preface of this
manual.

Restricted Distribution
RESTRICTED DISTRIBUTION: This publication is intended for use by IBM
personnel only and may not be made available to others without the
approval of local IBM management.

Major Revision, July 1967

This edition, Y24-S017-2, is a major revision of, and obsoletes Form
Y24-S017-1 and its Technical Newsletters Y24-S0S8, Y24-S0S3 and
Y24-S066. Changes are indicated by a vertical line to the left of
the affected text and ~o the left of affected parts of figures. A
dot (e) next to a figure title or page number indicates that the
entire figure or page should be reviewed.
Specifications contained herein are subject to change from time to time.
Any such change will be reported in subsequent revisions or Technical
Newsletters.
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 readers'
comments. If the form has been removed, comments may be addressed
to: IBM Corporation, Programming Publications, Endicott, New York
13760.

D International Business Machines, 1966, 1967
PREFACE

This Program Logic Manual (PLM) is a guide