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File No. 8360-20
Order No. GC28-6534-4 OS
o
Systems Reference Library
IBM System/360 Operating System
Introduction
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
o
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.
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Fifth Edition (November, 1972)
This is a reprint of GC28-6534-3 incorporating changes
released in the following Technical Newsletter:
GN28-2512 (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. GA22-6822, and the
current SRL NeWs'I'etter, 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
(C-'~
be addressed to IBM Corporation, Publications Development, I'
Department D58, Building 706-2, PO Box 390, Poughkeepsie, N.Y.
12602. Comments become the property of IBM.