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File No. 5360-36
Form C28-6628-3 OS




Systems Reference Library




IBM System/3S0 Operating System

System Control Blocks

This publication shows the formats of the major
control blocks and tables used by more than one
component of the System/360 operating System con-
trol 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 capabi1ities of the operating
system. Programs should refer to these control
blocks only through the system macro instruction
facilities provided in the operating system. (For
example, a field of the Data Control Block shou1d
only be referred to by use of the DCBD macro
instruction.) Programs that refer to the contr01
blocks by other means do so at the risk of not
executing correctly in the future.
Preface


This publication contains reference The reader of this manual must be famil-
information about the contents and format iar with the following publications:
of system control blocks. Most of the con-
trol blocks covered in this publication are
used by more than one component of the IBM System/360: Principles of Opera-
System/360 operating System control pro- tion, Form A22-6821
gram. A diagram of each block is followed
by descriptions of its fields. The block
descriptions are ordered alphabetically by IBM System/360 Operating System: Intro-
acronym. When a block has different access duction, Form C28-6534
method versions, they are arranged under
the block name in this order: SAM, I SAM,
DAM, TAM, GAM. IBM System/360 Operating system: Con-
cepts and Facilities, Form C28-6535
The pointer diagram previously shown in
this publication has been superseded by a
similar one now shown in the IBM publica- IBM System/360 Operating System: Super-
tion IBM System/360 Operating System: Pro- visor and Data Management Services, Form
grammer's Guide to Debugging, Form C28-6646
C28-6670.




Fourth Edition (November, 1968)


This is a major revision of, and obsoletes, C28-6628-2 and
Technical Newsletter N28-2360. The changes in content made
in this edition for this release are enumerated in a summary
of revisions which follows the table of contents. Changes
to the text, and small changes to illustrations, are indi-
cated by a vertical line to the left of the change; changed
or added illustrations are denoted by the symbol