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File No. 8360-32
Form C28-6666-0 OS




Systems Refe!rence Library




IBM Sys"tem/360 Operating System
Guide to Model 91 Support

This publicaition is a guide to considerations that
must be understood when programming on the IBM System/
360 Model 91. The information in this publication
applies to the l'1VT version of the IBM System/360
Operating System.
PREFACE
----



This publication describes features of Operator's Guide, Form C28-6540
the IBM Systern/360, Model 91, as they apply
to the IBM System/360 Operating System,
Multiprogramming with a Variable Nuwber of Messages and Codes, FormC28-6631
Tasks (MVT). All users of the Model 91
should be aware of the implications of PL/I (F) Programmer's Guide, Form
these features. The following publica- C28-6594
tions, if read as prerequisites to, or in
conjunction with, the associated sections FORTRAN IV Library Subprograms, Form
of this publication, provide the necessary C28-6596
background:
System programmers and, particularly,
programmers writing problem code in the
IBM_~ystem/360 Operating System: assembly language must be thoroughly famil-
ia::: with the associated material in the
Supervisor and Data MaJ.l_ageme~..!:___ Se~vi~es., following publications:
Form C28-6646
IBM System/360 Principles of Operation,
Supervisor and Data Manaqement Macro Form A22-6821
Instructions, Form C28-6647
IBM System/360 Model 91 Functional
Storage Estimates, Form C28-6551 Characteristics, Form A22-6907

~ystem Generation, Form C28-6554 The latter publication contains informa-
tion that is unique to the Model 91 and may
PL/I Language Specifications, Form amend corresponding material in the Prin-
C28-6511 ciples of Operation publication.




First Edition (November 1967)

This publication corresponds to Release 14.

Specifications contained herein are subject to change from time to
time. Any such change will be reported in subsequent revisions 'Jr
Technical Newsletters.



This publication was prepared for production using an IBM com:;mter to
update the text and to control the page and line format. Page impres-
sions for photo-offset printing were obtained from an IBM 1403 J?:cinter
using a special priniichain.

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

A form is provided at the back of this publication for reader'S com-
ments. If the form has been removed, comments may be addressed:o IBM
corporation, Programming Systems Publications, Department D58, p.) Box
390, Poughkeepsie, N. Y. 12602