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File No. 5360-36
Order No. GC28-6628-9 los
L
Systems Reference Library
IBM System/3S0 Operating System:
System Control Blocks
OS Release 21.7
This publication shows the formats of the major
control blocks and tables used by more than one
component of the System/360 Operating System
control program. Descriptions of each field
within the control blocks or tables follow each
format illustration.
The system control blocks described in this
publication will be changed by IBM from time to
time to extend the capabilities of the operating
system. Programs should refer to these control
blocks only through +ho system macro instruction
facili ties provided in the operating system. (For
example, a field of the Data Control Block should
only be referred to by use of the DCBD macro
instruction.) Programs that refer to the control
blocks by other means do so at the risk of not
executing correctly in the future.
Tenth Edition (April, 1973)
This is a major reV1S1on of, and obsoletes, GC28-6628-8. The
changes in content made in this edition for this release are
enumerated in a summary of amendments which follows the table
of contents. Changes or additions to the text and
illustrations are indicated by a vertical line to the left of
the change.
I This edition applies to release 21.7 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/370 Bibliography, GA22-6822, for the editions that
are applicable and current.
Request~ 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' COn~ents is provided at the back of
this publication. If the form has been removed, comments may
be addressed to IBM Corporation, publications Development,
Department D58, Building 706-2, po Box 390, poughkeepsie,
N.Y. 12602. Comments become the property of IBM.