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File No. S360-20
Order No. GC28-6670-5 OS




Systems Reference Library




IBM System/360 Operating System:
Programmer's Guide to Debugging
OS Release 21


This publication describes, in assembler
language terms" the major debugging facilities
provided with the system/360 Operating System.
It is written for the programmer who debugs
system and application programs.
The text explains those aspects of system
control pertinent to debugging, tells what
information each debugging facility offers, and
outlines procedures for obtaining and
interpreting dumps.

The various types of storage dumps available
under the MFT and MVT control programs and event
tracing facilities are described ..

Debugging facilities inherent in higher
languages and additional aids are discussed in
other SRL publications.
sixth Edition (March, 1972)



I This is a major revision of, and obsoletes GC28-6p70-4 and
Technical Newsletters GN28-2457 and GN28-2472. See summary
of Amendments following the Contents. Changes or additions
to the text and illustrations are indicated by a vertical
line to the left of the change.


I This edition applies to release 21 of IBM System/360
Operating System and to all subsequent releases until
otherwise indicated in new editions or Technical Newsletters.
Changes are continually made to the information herein;
before using this publication in connection with the
operation of IBM systems, consult the latest IBM System/360
and System/370 SRL Newsletter, Order No. 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
the publication. If the form has been removed, comments may
be addressed to IBM Corporation, Programming Systems
Publications,Department D58, P.O. Box 390, Poughkeepsie,
N. Y. 12602. Comments become the property of IBM.