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GY28-2020-2_Time_Sharing_System_FORTRAN_IV_Library_Subprograms_PLM_Sep71


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                                                    File No. 360-25
                                                    GY28-2020-2




                                                 Program Logic




Version B.l



IBM System/360 Time Sharing System
FORTRAN IV Library Subprograms


   This publication describes the internal logic of the
IBM System/360 Time Sharing System FORTRAN IV
mathematical and I/O libraries, including the
mathematical, service, and I/O routines.

   This material is intended for persons involved in
program maintenance, and system" programmers who are
altering the program design.   It can be used to locate
specific areas of the program, and it enables the
reader to relate these areas to the corresponding
program listings.  Program logic information is not
necessary for the use and operation of the program.
PREFACE


   This publication is organized into six                                          Appendix A describes those aspects of
sections and two appendixes.                                                    FORTRAN data management that are unique to
                                                                                the FORTRAN environment. Appendix B is a
   Section 1 is an introduction to the                                          guide to external names of FORTRAN library
FORTRAN mathematical and I/O libraries,                                         routines.
including service subprograms, and provides
a brief description of their contents and
functions.                                                                      PREREQUISITE PUBLICATIONS

   Section 2 contains descriptions, in                                             Familiarity with the material contained
figure form, of how the library routines                                        in the following publications is essential
interact in fulfilling user requests.                                           to the use of this manual:

   Section 3 describes each mathematical                                              IBM System/360 Time Sharing System:
subprogram -- its entry names, function,                                                 Concepts and Facilities, GC28-2003
attributes, entry, exit, storage                                                         IBM FORTRAN IV, GC28-2007
requirement, error checks, and (where                                                    FORTRAN Programmer's Guide, GC28-2025
applicable) accuracy figures.

   Section 4 describes the service routines                                     REFERENCE PUBLICATIONS
residing in the mathematical and I/O
libraries -- their subprograms, attributes,                                        Knowledge of the following publications
entry names and entry parameters, storage                                       will be helpful in understanding the
requirements, error checks, and their                                           concepts and logic of the FORTRAN Library
operation.                                                                      routines:
                                                                                      IBM System/360 Time Sharing System:
   Section 5 describes each I/O routine --                                               FORTRAN IV Library Subprograms,
its purpose, entry point and entry                                                       GC28-2026
parameters, external references, and the                                                 System Programmer's Guide, GC28-2008
details of its operation.                                                                Assembler User Macro Instructions,
                                                                                         GC28-2004
                                                                                         FORTRAN IV Compiler PLM, GY28-20l9
   Section 6 gives the flowcharts of the                                                 System Control Blocks PLM, GY28-20l1
service and I/O routines.                                                                System Logic Summary, GY28-2009




 Third Edition (September 1971)
    Significant changes or additions to this putlication will
 be provided in new editions or Tecru,ical Newsletters.
    This edition is current with Ver~ion 8, Modification 1 of
 IBM System/360 Time Sharing System (TSS/360) and remains in
 effect for all subsequent versions or n,odifications of IBM
 Systern/360 Time Sharing System unless otherwise indicated.
 Before using this publication, refer to the ldtest edition of
 IBM System/360 Time Sharing System:   AddendUll', GC28- 204 J,
~hl.ch    may contain information pertifH-



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