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File Number S360-30 (DOS)
Form Y24-5087-1
Program Logic
IBM System/360
Disk Operating System
Logical 10 CS
Volume 2: Unit Record, Magnetic Tape and
Device Independent Piles
Program Numbers
CDMOD 360N-IO-453
CPMOD 360N-CL-453
DIMOD 360N-CL-457
DTPCN 360N-CL-453
MRMOD 360N-IO-477
MTMOD 360N-IO-456
ORMOD 360N-IO-478
PRMOD 360N-CL-453
PTMOD 360N-IO-458
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:
Volume 1: Introduction, Form Y24-5020.
Volume 2: unit Record, Magnetic Tape, and Device
Independent Files, Form Y24-5087.
Volume 3: Sequential and Direct Access DASD Files,
Form Y24-5088.
Volume 4: Indexed Sequential File Management System,
Form Y24-5089.
This manual is intended for persons involved in
program maintenance and by system programmers who dl.e
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 responsibilities.
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 Bibliography,
Form A22-6822.
Restricted Distribution
RESTRICTED DISTRIBUTION: This publication is intended
primarily for use by IBM personnel involved in program design
and maintenance. It may not be made available to others
without approval of local IBM management.
seco!!!L~dition (October 1968)
This edition applies to Release 19 of IBM System/360 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 SRL
Newsletter, Form N20-0360, for the editions that are
applicable and current.
This edition, Y2q-5087-1, is a major reV1S1on of, and
obsoletes Y2Q-5087-0 and Technical Newsletters Y2Q-5098 and
Y2Q-510Q.
Summary of Amendments
In addition to consolidating information in the obsoleted
publications, this manual incorporates documentation
describing changes made to Version 3 Disk Operating System
Logical IOCS programs by Release 19 (Asynchronous
Processing)