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File Number S360-36
Form Y24-S084-0
Program Logic
IBM System/360
Disk Operating System
Supervisor and Physical and Logical Transients
Program Number 360N-CL-453, Version 3
This pUblication describes the internal logic of
the IBM System/360 Disk Operating System,
Supervisor and Transients Programs. It 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 needed for normal operation of
these programs; therefore, distribution of this
publication is limited to those with maintenance
and alteration requirements. It is designed to be
used as a supplement to the program listing.
Effective use of this manual requires an
understanding of IBM System/360 operation and of
IBM System/360 Disk Operating System control and
service programs, macro instructions, and
operating procedures. Reference publications for
this information are listed in the Pr.eface of this
manual.
For overall system control logic description, this
PLM is to be used with four other PLMs:
IBM System/360 Disk Operating System, Introduction
to System Control Programs, Form Y24-S0l7.
IBM System/360 Disk Operating Syste~, Lifrrarian
Maintenance and Service Programs, Form Y24-S079.
IBM System/360 Disk Operating System, Linkage
Editor, Form Y24-S080.
IBM System/360 Disk Operating System, IPL and
Job Control Programs, Form Y24-S086.
Restricted Distribution
PREFACE.
This Program Logic Manual (PLM) is a IBM System/360 Disk Operatin9-System,
detailed guide to the IBM System/360 Disk Basic Telecommunications Access Method
Operating System supervisor, physical PLM, Form Y30-5001.
transient, and logical transient programs.
It supplements the program listings by
providing descriptive text and flowcharts. IBM System/360 Disk operating SystemL
Queued Telecommunications Access Method
Prerequisite and related publications PL~, Form Y30-5002.
that aid in the use of this manual are:
IBM System/360 principles of .Operation, Titles and abstracts of other related
Form A22-6821. publications are listed in the IBM
System/360 Bibliography, Form A22-6822.
IBM System/360 Disk Operating SystemL
System Control and service Programs, This manual consists of seven m~jor
Form C24-5036. sections. The first section is an
introduction to the supervisor and
IBM System/360 Disk operating System, transient programs. The next section
supervisor and~ut/output Macros, Form describes the generation and organization
C24-5037. of the supervisor. The next four 'sections
describe the detailed operation of the
IBM System/360 Disk Operating System, supervisor, physical IOCS, physical
System Generation and Maintenance, Form transients, and logical transients. The
C24-5033. last section of the manual, the appendixes,
contains the label list, error messages,
IBM System/36.O Disk operating System, and other references for use in analyzing
Operating Guide, Form C24-5022. program details.
IBM system/360 Disk Operating System, The flowcharts for all components are
Data Management Concepts, Form C24-3427. located at the end of the manual. The
detailed flowcharts are identified by
IBM System/360 Disk and Tape operating letters AA through ZZ. Numerals, such as
Systems: Assembler specifications, Form 00 fo