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Z24-5022-0
Program Logic
IBM System/360 Basic Operating System
System Control (16K Tape)
Program Logic Manual
Program Number 360M-CL-405
This manual was prepared by Programming Systems to
provide detailed information on the internal logic
of the IBM System/360 16K Tape System Control
Programs. It is intended for technical personnel
who are responsible for diagnosing the system
operation and/or adapting the programming system
to special usage.
RESTRICTED DISTRIBUTION-- SEE ABSTRACT
PREFACE
The prerequisites for a thorough 1. Detailed flowcharts with accompanying
understanding of this publication are a narratives and a cross-reference label
basic knowledge of both System/360 list provide a quick guide to the
programming concepts and Basic Operating program listing.
System 16K Tape Control-Programs. The 2. summaries of program flow, I/O flow,
publications providing this information storage allocation, and constant areas
are: provide a basic understanding of the
IBM System/360 PrinQiples of operation, program logic.
Form A22-6821;
IBM System/360 Basic Operating System:
System Control and System Service This publication describes the program
Programs (16K Tape), Form c!24- 3431; logic at three levels:
IBM System/360 Basic Operating System: System level. A brief description of the
Supervisor and Input/Output Macros (16K programs in the system and how they
~, Form C24-3432; relate to one another.
IBM System/360 Basic Operating System: Program level. A general description of
System Generation_and Maintenance (16K the flow of each program describing the
~, Form C24-5015. routines within the program and
information common to these routines.
Closely related publications are: Routine level. A detailed description of
IBM System/360 Basic Operating System: the flow of each routine with reference
Assembler language Speci fications (16K to a detailed flowchart of the routine.
Disk/Tape), Form C24-3414;
IBM System/360 Basic Operating System:
Data Management Concepts (16K Tape), Information common to all programs in
Form C24-3430. the system is found in the discussion of
the Supervisor, and a detailed layout of
This publication is designed to help the system residence is found in the
reader in two ways: introduction to the Librarian.
copies of this and other IBM publications can be obtained through IBM
Branch Offices. A form has been provided at the back of this
publication for readers' comments. If the form has been detached,
COlIIII\ents may be directed to:
IBM Programming Publications, Endicott, New York 13760.
@ International Business Machines, i966.
CONTENTS
IBM SYSTEMl360 BOS, SYSTEM CONTROL Job Control Initialization
(16K TAPE)