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File No. 5360-20
Order No. GC28-6670-6 OS




Systems Reference Library




IBM System/3S0 Operating System:
Programmer's Guide to Debugging
OS Release 21.7
Page of GC28-6670-5,6, Revised April 16, 1973, By TNL: GN28-2545




Seventh Edition (November, 1972)

This is a reprint of GC28-6670-5 incorporating changes
released in the following Technical Newsletter:
GN28-2520 (dated April 15, 1972)

This edition with Technical Newsletter GN28-2545 applies to
release 21.7 and component release 360S-0S-586 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 S stem 360 and S stem 370 Biblio ra h ,
GA22-6822, for the e ~t~ons t

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, Publications Development,
Department D58, Building 706-2, PO ,Box 390, poughkeepsie, N.Y.
12602. Comments become the property of IBM.



C Copyright International Business Machines Corporation 1967,1968,1969,1970,1971,1972
Preface



This publication is intended to help you For information on debugging facilities
use the debugging facilities provided with provided within higher languages, consult
the IBM System/360 Operating system. It the programmers' guides associated with the
describes., in assembler language terms, the respective languages. Other Systeml360
major debugging facilities provided with Operating system publications, such as
the Systeml360 operating System, and is Messages and Codes, describe additional
directed towards the programmer who deals debugging aids provided for the assembler
with system and application program language programmer.
problems.
Notice: Coding level information presented
in this publication must not be used for
The publication is divided into three coding purposes or exposure to changes in
principal parts: "Section 1: Operating implementation may result. The information
System Concepts;" "Section 2: Interpreting is presented for debugging purposes only.
Dumps;" and "Section 3: Tracing Aids,