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                                                                Y28-6609-1.




                                                           Program Logic




IBM System/360 Operating System
Input/Output Support (OPEN/CLOSE/EOV)


Program Logic Manual

Program Number 360S-DM-50B


   This publication describes the internal logic of IBM
System/360 Operating System input/output support. The
discussion includes the relation of I/O support rou-
tines to other portions of the control         program.
Detailed descriptions of the open, close, and EOV
routines provide the basis for the discussions of the
other I/O support routines openJ, RDJFCB, Tclose, and
FEOV.
   Program Logic Manuals are intended for use by IBM
customer engineers involved in program rraintenance, and
by system programmers involved in altering the program
design. Program logic information is not necessary for
prograrr operation and use; therefore, distribution of
this manual is limited to persons with program mainten-
ance or modification responsibilities.




              Restricted Distribution
PREFACE




   This publication des crites the functions                     IBM System/360 Operating System:       Con-
and organization of the input/output (I/O)                       cepts and Facilities, C28-6535
support portion of System/360 Operating
Systerr. It also describes the relationship                     IB~  System/360 Operatinq     system: Data
of I/O support to other portions of the                         Managerrent, C28-6537
operating system.
                                                                 IB~ System/360 Operating System: Intro-
                                                                 duction to Control Program Logic, Pro-
   The publication is divided into sections                      gram Logic Manual, Y28-6605
that describe each of the major corrponents
of I/O support.     Each section refers to
flowcharts that show the sequence in which                  SUGGESTED READING
the functions are performed. Appendixes
are included to show the formats of work                        Inforrration related to that provided in
areas and tables used by I/O support.                       this publication is supplied throughout the
                                                            following publications:
PREREQUISITE PUBLICATIONS                                        IB~ System/360 Operating System:   Contro~
                                                                 Prograrr services, C28-6541
    The reader of this publicaticn nust be
familiar with the concepts described in the                      IBM System/360 Operating     System:   Job
following publications:                                          Contrcl Language, C28-6539




Second Edition (Fetruary 1967)

This publication is a major revision of F

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