Service Manuals, User Guides, Schematic Diagrams or docs for : IBM 360 os R19_Jun70 GC28-6628-5_System_Control_Blocks_Rel_19_Jun70

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                                                   File No. S360-36   .-----1 .
                                                   GC28-6628-5         os




Systems Reference Library




IBM System/360 Operating System:
System Control Blocks

This publication shows the formats of the major
control blocks and tables used by more than one
component of the System/360 Operating System
control program. Descriptions of each field
within the control blocks or tables follow each
format illustration.

    The system control blocks described in this
publication will be changed by IBM from time to
time to extend the capabilities of the operating
system. Programs should refer to these control
blocks only through the system macro instruction
facilities provided in the operating system.
 (For example, a field of the Data Control Block
should only be referred to by use of the DCBD
macro instruction.)   Programs that refer to the
control blocks by other means do so at the risk
of not executing correctly in the future.




                                                                       --"....-
Preface


    This pu.olication contains reference                Tte reader of this manual must be
information about the contents and format            familiar with the following publications:
of system control blocks. Most of the
control Dlocks covered in this publication
are used by more t~han one component of the              IBM System/360: Principles of
system/360 Operating System control                      Operation, GA22-6821
program. A diagram of each block is
followed by descriptions of its fields.
The block descriptions are ordered                       ~BM system/360 Operating system:
alphabetically by acronym. When a block                  Introduction, GC28-

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