IBM GC28-6628-9 OS System Ctl Blks R21.7 Apr73 free download

File name GC28-6628-9_OS_System_Ctl_Blks_R21.7_Apr73.pdf

File No. 5360-36 Order No. GC28-6628-9 los L Systems Reference Library IBM System/3S0 Operating System: System Control Blocks OS Release 21.7 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 +ho system macro instruction facili ties 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. Tenth Edition (April, 1973) This is a major reV1S1on of, and obsoletes, GC28-6628-8. The changes in content made in this edition for this release are enumerated in a summary of amendments which follows the table of contents. Changes or additions to the text and illustrations are indicated by a vertical line to the left of the change. I This edition applies to release 21.7 of IBM System/360 operating System and to all subsequent releases until otherwise indicated in new editions or Technical Newsletters. changes are continually made to the information herein; before using this publication in connection with the operation of IBM systems, consult the latest IBM System/360 and System/370 Bibliography, GA22-6822, for the editions that are applicable and current. Request~ for copies of IBM publications should be made to your IBM representative or to the IBM branch office serving your locality. A form for readers' COn~ents is provided at the back of this publication. If the form has been removed, comments may be addressed to IBM Corporation, publications Development, Department D58, Building 706-2, po Box 390, poughkeepsie, N.Y. 12602. Comments become the property of IBM.