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Y28-6612-2
Program Logic
IBM System/360 Operating System
Fixed-Task Supervisor
Program Number 360S-CI-505
This publication describes the fixed-
task supervisor, which performs task
management as a major part of the primary
control program of IBM System/360 Operating
system. In addition, this manual describes
the initial program loader (IPL) and the
nucleus initialization program (NIP).<
Program Logic Manual~ are intended for
use by IB~ customer eng1neers involved in
program maintenance, and by system program-
mers involved in altering the program de-
sign. Program logic information is not
necessary for program operation and use;
therefore, distribution of this manual is
limited to persons with program maintenance
or modification responsibilities.
Restricted Distribution
Form Y28-6612-0,-1,-2., Page Revised by TNL Y28-2114, 4/10/61
PREFACE
This manual describes the internal design IBM System/360: Principles of Operation,
of the fixed-task supervisor of IBM Form A22-6821
System/360 Operating System. Although this
publication contains information concerning
the supervisor in environments with a fixed IBM System/360 Operating system: Con-
number of tasks, this publication is issued cepts and Facilities, Form C28-6535
only in support of single-task environments
without protection. The external charac-
teristics of this supervisor are described IBM System/360 operating System: Super-
in the IBM Systems Reference Library. visor and Data Management services, Form
C28-6646
Information in this document is directed
to the customer engineer who maintains and
se~ices IBM System/360 Computing System IBM System/360 Operating System: Super-
and who is responsible for field mainten- visor and Data Management Macro-
ance and updating of IBM System/360 Operat- Instructions, Form C28-6641
ing system. This information may also be
used by the programming systems maintenance
programmer and the development programmer IBM system/360 Operating system:
who will expand the system. TESTRAN, Form C28-6648
This publication may be used to locate
those areas of the system to be analyzed or IBM System/360 Operating System: Linkage
modified. The information is presented to Editor, Form C28-6538
enable the reader to quickly relate the
task management functions to the program
listings (coding) for those functions. The IBM System/360 Operating System: System
comments in the listings provide informa- Programmer's Guide, Form C28-6550
tion for thorough analysis and understand-
ing of the coding. IBM System/360 Operating System: System
Generation, Form C28-6554
PREREQUISITE PUBLICATIONS
Knowledge of the information in the IBM System/360 Operating System: Intro-
following publications is required for a duction to Control Program Logic, Pro-
full understanding of this manual. gram Logic Manual, Form Z28-6605
Third Edition (February 1967)
This is a reprint of Y28-6612-1, incorporating changes released in the
following Technical Newsletter:
Form Number Date
Y28-2161 September, 1967
Specifications contained herein are,subject to change from time to time.
Any such change will be reported 1n subsequent revisions or Technical
Newsletters.
This publication was prepared for production using an IBM computer to
?pdate ~he text and to control the page and line format. Page
1mpress1ons for photo-offset printing were obtained from an IBM 1403
Printer using a special print chain.
Copies of this and other IBM publications can be obtained through IBM
Branch Offices.
A form for readers' comments appears at the back of this publication;
It may be mailed directly to IBM. Address any additional comments
concerning this publication to Programming Systems Publications,
Department 058, PO Box 390, poughkeepsie, N. Y. 12602
Form Y28-6612-0,-1,-2, Page Revised by TNL Y28-2174, 4/10/67
CONTENTS
INTRODUCTION.