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                                                      File No. 5360-21
                                                      Form C28-68ll-1    44PS




Systems Reference Library




IBM System/3S0 Model 44
Programming System
Assembler Language
   This publication contains specifications for the IBM
System/360 Nodel 44 Programming System Assembler Lan-
guage.

   This assembler language is used to write      programs
for the Model 44. The IBM System/360 Model 44    Program-
ming System Assembler program processes the      lanquage
and provides auxiliary functions useful in the   prepara-
tion and documentation of a program.
PREFACE


   This publication is a reference manual                       basic courses    of   instruction   in    these
for the programmer using the assembler                          areas.
language and its features.

   This publication presents information                           The publications most closely supplemen-
common to all parts of the language, fol-                       tal to this one are:
lowed by specific information concerning
the symbolic machine instruction codes and                          IBM System/360: Principles of Operation,
the assembler program functions provided                            Form A22-6821
for the programmer's use.
                                                                    IBM System/360:   System   Summary,    Form
   Appendixes A through F present such                              A22-6810
items as a summary chart for constants,
instruction listings, character set rep-                            IBM  System/360 Model 44: Functional
resentations, and other aids to program-                            Characteristics, Form A22-6875
ming.   Appendix G is a features comparison
chart of system/360 assemblers.                                     IBM System/360 Model 44 Programming Sys-
                                                                    tem:   Concepts  and Facilities, Form
   Knowledge   of IBM System/360 machine                            C28-6810
operations, particularly storage address-
ing, data formats, and machine instruction                          IBM System/360 Model 44 programming Sys-
formats and functions, is prerequisite to                           tem: Guide to System Use, Form C28-6812
using this publication. It is assumed that
the reader has experience with programming                          Data Acguisition Special Features for
concepts and techniques or has completed                            IBM System/360 Model 44, Form A22-6900




Second Edition

This is a major rev~s~on of, and makes obsolete, C28-6811-0. section 7,
"Update Feature," has been substantially revised to include additional
information and examples of update operations.   Appendix G,   "Features
Comparison Checklists," has been rewritten to define more specifically
the relationship between the IBM systeml360 Model 44 programming system
Assembler Language and the other system/360 programming support system
assembler languages.    Because of a change in specifications, all
references to the length attribute of a symbol have been deleted.
Changes to the text other than these are indicated by a vertical line to
the left of the change.

specifications contained herein are subject to change from time to time.
Any such change will be reported in subsequent revisions or Technical
Newsletters.

Copies of this       and other IBM publications can be obtained through IBM
Branch Offices.

A form is provided at the back of this publication for reader's
comments.   If the form has been removed, comments may be addressed to
IBM corporation, Programming Publications, 1271 Avenue of the Americas,
New York, N.Y., 10020.

    ~   1966 by International Business Machines Corporation




2
                                                                                         CONTENTS


SECTION 1: INTRODUCTION. 

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