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File Number S360-30 (DOS)
Order No. GY24-5088-4
Program Logic
DOS LIOeS Volume 3
SAM and DAM for DASD
Program Numbers
SDMOD 360N-IO-455
DAMOD 360N-IO-454
This reference publication is one of four Program Logic
Manuals that describe the internal logic of the Logical IOCS
(Input/Output Control system) programs for the IBM system/360
Disk operating System. The four related Program Logic Manuals
are listed below.
Note: Although titles of some DOS publications have been
simplified, the change does not affect the contents of the
publications. ;
Volume 1: Introduction, GY24-5020.
Volume 2: Unit Record l Magnetic TaEe l and Device IndeEendent
Files, GY24-5087.
Volume 3: SAM and DAM for DASD, GY24-5088.
Volume 4: ISFMS GY24-5089.
This manual is intended for use by persons involved in
program maintenance and by system programmers who are altering
the program design. Program logic information is not
necessary for the operation of the programs described~
Therefore, distribution is limited to those with maintenance
and alteration responsibi1ities.
Effective use of this publication requires an understanding
of IBM System/360 operation and the Disk Operating System
Assembler language and its associated macro definition
language. Reference publications for this information are
listed in the Preface.
For the titles and abstracts of other related publications,
refer to the IBM system/360 and system/370 BiblioqraEhy,
GA22-6822.
DOS Release 25
Fifth Edition (April 1971)
This publication was formerly titled IBM System/360 Disk
operating System Loqical IOCS Volume 3: Sequential and
Direct Access DASD Files. Although titles of some,DOS
publications (including this one) have been simplified, the'
change does not affect the contents of the publications.
This edition applies to Release 25 of IBM System/360 Disk
operating system and to all subsequent releases until
otherwise indicated in new editions or Technical Newsletters.
Changes are continua~lymade 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.
This edition is a major revision of, and obsoletes,
GY24-5088-3 and Technical Newsletter GN24-5421.
summary of Amendments
The changes to this manual reflect the program modifications
concerning data set security and improved forced end of
volume for disk. support is also included for the IBM 2319
Disk storage Facility. The flowchart symbols used in this
manual conform wi'th the American National Standards
Institute, Inc. flowcharting standards. See Appendix F for
an explanation of the symbols. Miscellaneous maintenance
changes are also included. '
Changes to the text and illustrations are indicated by a
vertical line to the left of the change.
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 Publications,
Department G60, P.O. Box 6 Endicott, New York, 13760.