System Control Blocks

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386 OS System Control Blocks (Release 21.1)
Time-Sharing Option Control Blocks The time sharing (TSO) control blocks described in this portion of the manual are (1) those that can be used to write and interpret TSO commands. and (2) those required to replace the TSO driver routines with user-written driver routines. For description of the TSO control blocks not found in this manual, see the publications IBM Systeml360 operating system: Service Aids, GC28-6719 and IBM Svsteml360 Operating System: TSO Control Program PLM, GY27-7199. TSOCB 387
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Systems Reference Library IBM Syste
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Figures Figure 1A. Pointer Diagram
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System Control Blocks System contro
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. ..J MFT Figure lA. Pointer Diagra
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Contents Directory Entry (MVT Only)
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20 OS System Control Blocks (Releas
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0(0) 4 (4) 8 (8) 12 (c) 16 (10) 20
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DATA CONTROL BLOCK -- SAM Continued
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Device Interface 16 (10) Common Int
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Offset Bytes and Field Alignment Na
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Device Interface 16 (10) Common Int
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WTTA Interface 16 (10) DCBBQFLG Dat
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DATA CONTROL BLOCK -- TCAM The form
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112 OS System Control Blocks (Relea
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Appendage Table DATA EXTENT BLOCK -
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DATA EXTENT BLOCK -- QTAM MESSAGE P
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DATA EVENT CONTROL BLOCK -- BSAM Th
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DATA EVENT CONTROL BLOCK -- BlSAM T
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o (0) DATA EVENT CONTROL BLOCK -- B
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DATA EVENT CONTROL BLOCK -- QTAM Th
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DATA EVENT CONTROL BLOCK -- BTAM Th
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Device Name Table The device name t
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166 05 System Control Blocks (Relea
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10 (0) ....,r- 44 (2C) DS1FMTID For
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72 (48) FORMAT 2 -- INDEX DATA SET
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FORMAT 3 -- EXTENSION DATA SET CONT
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...... ---r 0(0) 4 (4) 44 (2C) DS5F
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FORMAT 6 -- SHARED EXTENT DATA SET
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Data Set Labels -- Magnetic Tape Th
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o (0) :.::: 4 (4) .,r- Continued Co
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198 OS system Control Blocks (Relea
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0(0) 4 (4) 16 (10) 36 (24) FL2RECFM
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Event Control Block The event contr
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INTERRUPTION CONTROL BLOCR 0(0) ICB
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Input/Output Block The input/output
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JOB STEP CONTROL BLOCK 240 (FO) JSC
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240 os System Control Blocks (Relea
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REQUEST BLOCKS -- MVT CONFIGURATION
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Interruption Request Block -- MVT T
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proqram Request Block -- MVT The pr
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Supervisor Request Blocks -- MVT Th
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Supervisor Request Block -- MVT --
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SUPERVISOR REQUEST BLOCK -- MVT --
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Bytes and Offset Alignment 105 (69)
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Offset 31 (IF) 32 (20) Byte and Fie
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TIMING CONTROL TABLE 0(0) TCTQA 3 (
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Page 383 and 384: Volume Table of Contents The volume
Page 385: Volume Table of Contents The volume
Page 389: Driver Parameter Area The driver pa
Page 392: ENVIRONMENT CONTROL TABLE 0(0) ECTR
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