Text preview for : GC28-6628-5_System_Control_Blocks_Rel_19_Jun70.pdf part of IBM GC28-6628-5 System Control Blocks Rel 19 Jun70 IBM 360 os R19_Jun70 GC28-6628-5_System_Control_Blocks_Rel_19_Jun70.pdf
Back to : GC28-6628-5_System_Contro | Home
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-