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File No. S360-20
Order No. GC28-6534-4 OS

Systems Reference Library

IBM System/360 Operating System
IntrDductiDn

This publication describes operating systems in
general and introduces the IBM System/360
Operating System. The publication is intended for
anyone interested in the System/360 Operating
system, whether or not he is familiar with other
operating systems. It describes the purpose,
design objectives, organization, function, and
application of the system/360 Operating System,
and how it was influenced by previous systems; i t
also describes System/360 compatibility with
System/ 370.

The operating system consists of programming
aids and a control program that schedules and
supervises the processing of data. The system is
designed for a broad range of applications,
including teleprocessing and multiprocessing. It
helps a System/360 data processing installation
increase productivity by using its resources more
effectively_
Fifth Edition (November, 1972)

This is a reprint of GC2B-6534-3 incorporating changes
released in the following Technical Newsletter:
GN2B-2512 (dated January 15, 1972)

This edition applies to release 21 of IBM System/360
Operating System, and to all subsequent releases until
otherwise indicated in new editions or Technical Newsletters.
Changes are continually made to the information herein;
before using this publication in connection with the
operation of IBM systems, consult the latest IBM System/360
and system./370Bibliograph
a,Order No. GA22-6B22, and the
current SRL NeWsTe'tter, Or er No. GN20-0360, for the
editions that are applicable and current.

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

A form for readers' comments is provided at the back of
this publication. If the form has been removed, comments may
be addressed to IBM Corporation, Publications Development,
Department D5B, Building 706-2, PO Box 390, Poughkeepsie, N.Y.
12602. Comments become the property of IBM.

@ Copyright International Business Machines Corporation 1964,1966,1969,1971
Preface

This publication introduces you to the IBM