IBM GC28-6628-5 System Control Blocks Rel 19 Jun70 free download

File name GC28-6628-5_System_Control_Blocks_Rel_19_Jun70.pdf

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-