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File Number S360(Mod.20)-36
Form ~24-9006-4 DPS
Systems Reference Library
IBM System/360 Model 20
Disk Programming System
Control and Service Programs
This publication describes the purpose and funct ~')ns of
the Control and Serv~ce programs of the IBM System/360
Model 20 Disk Programming System (OPS).
The publication is designed to help you use the OPS
Control and Ser~ ice programs to build, run" and main-
tain a disk-resident system. '
The disk-resident system controls the compilation~
assembly. and execution of problem programs. It offers
you many advantages: a core-image library to store your
programs, batch job processing for continuous opera-
tion~ inquiry for access to specific information while
another program is runningr multiphase loading for
particularly long programs, and symbolic addressing of
I/O devices for greater flexibility.
To benefit from this publication" you should have a
basic knowledge of the IBM System/360 Model 20, and be
familiar with either the Assembler language or RPG.
You can find the titles and abstracts of related
publications in IBM System/360 Model 20" Bibliography.
Form A26-3565.
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IFifth Edition (March~ 1969) I
I , !\ I
IThis is a major revision Qf. pnd obsoletes C24-9006-3 and Technical Newsletters I
IN33-9045 and N33-9049 and N33-9042. I
I , I
I Most of the text has been rewritten and reorganized to make the publication I
leasier to understand. These improvements are not marked. I
I I
IThe technical changes incorporated in the publication relate to the delivery ofl
IIBM System/360 Model 20, Submodel 5, and to the addition of the COPSYS andl
I BACKUP programs to the DPS. These technical changes and additions are markedl
lin t:he following way: Changes to the text, and small changes to illustrations. I
lare indicated by a vertical line to the left of the change; changed 0r addedl
lillustrations are denoted by the symbol. to the left of the caption; addedl
Ipages are flagged by the symbol