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File Number 8360-30
Order Number GY28-6618-4

Program Logic

IBM Systemj360 Operating System
Indexed Sequential Access Methods
Program Logic Manual

Program Number 360S-I'O-5,26

This publication describes the program logic of the two
indexed sequential access methods: the queued indexed
sequential access method (QISAM) and the basic indexed
sequential access method (BISAM). It also discusses the
relationship of indexed sequential access method routines to
other parts of the control program.

Program Logic Manuals are intended for use by IBM
customer engineers involved in program maintenance, and by
system programmers involved in altering the program design.
Fifth Edition Qune 1971)

This is a major revision of, and makes obsolete, GY28-6618-3 and technical
newsletter GN26-8001. The manual has been reorganized (see the preface)
and more detailed flowcharts of some of the ISAM modules added.
Technical information about rotational position sensing (RPS) devices (IBM
3330 and 2305 Direct Access Storage Devices) has been included in "Section
1: Introduction," and "Section 2: ISAM Common Open, Common Close,
and Validation Modules."

This edition applies to release 20.1 of the IBM System/360 Operating
System and to all subsequent releases until otherwise indicated in new
editions or technical newsletters. Changes to the information in this book
may be made at any time; before using this publication in connection with
the operation of IBM systems, consult the latest SRL Newsletter, GN20-
0360, for the editions that are applicable and current.

Requests for copies of IBM publications should be made to your IBM
representative or to the IBM branch office serving your locality.

A form for readers' comments is provided at the back of this publication.
If the form has been removed, comments may be addressed to IBM
Corporation, Programming Publications, Department D78, Monterey and
Cottle Roads, San Jose, California 95114. Comments become property of
IBM.