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File Numbe'r S360-30
Order No. GC24-S037-12 DOS




Systems Reference Library




DOS Supervisor and liD Macros


This reference publication is for the programmer
planning to use the DOS Input/Output Control
System macro instructions and supervisor
communication macro instructions. These macro
instructions can be combined with problem programs
to produce generalized or specific file processing
programs for a foreground or background
environment. The major' subjects describe the
macro system, label processing, multitasking
macros, physical IOCS, supervisor communication
macros, and sequential, direct, and indexed
sequential access methods. Prerequisite
information is contained in the following
publications.

Note: Although titles of some DOS publications
have been simplified, the change does not
affect the contents of the publications.


DOS System Programmer's Guide, GC24-S073

DOS DASD Labels, GC24-S072

IBM System/360 Principles of Operation,
GA22-6821

IBM System/360 Disk and Tape Operating Systems,
Assembler Language, GC24-3414

DOS Data Management Concepts, GC24-3427

For titles and abstracts of other associated
publications, see the IBM System/360 and
System/370 Bibliography, GA22-6822.




DOS Release 26.2
Thirteenth Edition (October, 1973)

This is a reprint of GC24-5037-ll incorporating changes
released in the following Technical Newsletters:

GN33-8737 (January 1, 1973)
GN33-8757 (July 13, 1973).

This edition applies to Release 26.2 of the IBM Disk Operating
System and to all subsequent releases until otherwise
indicated in new editions 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 System/360 and System/370 SRL
Newsletter, 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.

Comments concerning the contents of this publication may be
addressed to IBM Laboratory, Publications Department,
P.O. Box 24, Uithoorn, The Netherlands. Comments become the
property of IBM.

e Copyright International Business Machines Corporation 1966, 1968, 1970, 1971
Preface

This reference publication is a guide for
the programmer planning to use the DOS
Input/Output Control Systerr. rracro
instructions and supervisor communication
macro instructions. It describes the
macros and their various operands. The
publication has ten sections. The first
two sections, Introduction and Macro
Sys.!:~~" in troduce -concepts and terrri nology.
The third section describes Label
~roc~~