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File No. S360-20
Order No. GC28-6534-3 OS




Systems Reference Library




IBM System/360 Operating System
Introduction
OS Release 21


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; it
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
effect ively.
Page of GC28-6534-3, Revised Ja.nuary 15. 1972. By TNL: GN28-2512




Fourth Edition (June, 1971)

This revision obsolet~es GC28-6534-2, Technical Newsletters
GN28-2450 and GN28-2458, and replaces IBM System/360
Operati~System: Concepts and Fa~ilities, GC28-6535. It
describes only the MET and MVT configurations of the control
program. Changes to the text and small changes to
illustrations are indicated by a vertical line to the left of
the change. This publication contains a means of referencing
other publications by the use of superscript notation.
superscripts refer to the numbered publications listed in
Part 3, Bibliography.
This edition, with Technical Newsletter GN28-2512,
corresponds to Release 21" of IBM System/360 Operating
system, and to all subsequent release until other,,?,ise
indicated in new edit:ions or Technical Newsletters. Changes
are continually made to the specifications herein; before
using this publication in connection with the operation of
IBM systems, consult the latest IBM System/360 and
IBM System/370 SRL NElwsletter, Order 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, Programming Systems
Publications, DepartD~nt D58, PO Box 390, Poughkeepsie, N. Y.
12602. Comments become the property of IBM.