System Control Blocks

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JOB STEP CONTROL BLOCK 240 (FO) JSCBTTTR 243 (F3) JSCVSWTl TTR of TIOT Extension Flag Byte 244 (F4) JSCBQMPI Address of Job's Input QMPA 248 (F8) JSCBQMPO Address of Job's Output QMPA 252 (FC) 256 (loa) JSCBWTFG Address of Write-to-Programmer Work Area JSCBCSCB Address of Command Scheduling Control Block 260 (104) JSCBJCT 1261 (105) MVT Extension 264 (l08) 268 (laC) 272 JSCBT JID User T JID Figure 21. Job Step Control Block 238 OS System Control Blocks (Release 21.1) JSCBPSCB Address of the PSCB JSCBIECB 270 (lOE) JSCBJCTA Reserved
Offset 240 (FO) 3 243 (F3) .1 244 (F4) 4 248 (F8) 4 (FC) 4 256 (100) 4 260 (104) 4 261 (105) • 3 264 (108) 4 268 (10C) 2 210 (10E) •• 2 272 (110) 4 Bytes and Field Alignment Name JSCBTTTR JSCVSWTl 1 ••. .. 1. . ... • x.x xxxx JSCBQMPI JSCBQMPO JSCBWl'FG Byte 1 Bytes 2-4 JSCBCSCB Byte 1 Bytes 2-4 JSCBJCT JSCBJCTA JSCBPSCB JSCBTJID JSCBIECB JOB STEP CONTROL BLOCK Field Description, contents, Meaning Note: The first valid field in the JSCB is at offset 240 (Fa) from the beginning of the JSCB. The relative track address (TTR) of the TIOT extension. '1:" __ \... ... .L._ r ..LQy ".rxt-c. JSCBPASS-Bypass password protection. MFT: The partition cannot be redefined because the job occupying it is defined as long-running. MVT: Reserved .. Reserved • Address of the job's input QMPA. Address of the job's output QMPA. Text breaking indicator. The address of the write-to-programmer work area used to write messages to this job step's system output data set. Reserved. The address of the command scheduling control block used to process commands received for this job step. A fullword name used to refer to JSCBJCTA. The relative track address (TTR) of the job's JCT. MVT Extension TSO: The address of the protected step control block (PSCB). TSO: The terminal job identification (TJID) of the user for which this task is being performed. Reserved. TSO: ECB for communication between dynamic allocation and the initiator. JSCB 239
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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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Offset -8 (-8) 2 Bytes and Field Al
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Offset 124 (7C) 4 128 (80) 4 132 (8
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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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Offset 53 (35) • 3 56 (38) 1 57 (
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Device Interface 16 (10) Common Int
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Offset 16 (10) 1 11 (11) • 1 18 (
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Offset 40 (28) 8 48 (30) 1 49 (31)
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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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Offset 20 (14) 1 21 (15) • 3 24 (
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Offset Bytes and Field Alignment N
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DATA CONTROL BLOCK -- TCAM The form
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Offset 33 (21) • 3 36 (24) 1 37 (
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Offset 52 (34) 1 52 (34) 4 56 (38)
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112 OS System Control Blocks (Relea
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Appendage Table DATA EXTENT BLOCK -
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offset -36 (-24) 4 -32 (-20) 4 -28
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Offset +0 +0 +0 +1 +0 +4 +8 +0 +4 +
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DATA EXTENT BLOCK -- QTAM MESSAGE P
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Offset 48 (30) 4 52 (34) 1 53 (35)
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- 36 (- 24) -32 (-20) -28 (+ lC) -2
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DATA EVENT CONTROL BLOCK -- BSAM Th
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Offset 12 (e) 4 16 (10) 4 20 (14) 4
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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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Offset 28 (lC) 29 (lD) • 1 Bytes
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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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Offset 64 (40) 2 Bytes and Alignmen
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FORMAT 3 -- EXTENSION DATA SET CONT
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Offset o (OJ 44 44 (2C) 1 45 (2D)
Page 188: ...... ---r 0(0) 4 (4) 44 (2C) DS5F
Page 191 and 192: FORMAT 6 -- SHARED EXTENT DATA SET
Page 193 and 194: Data Set Labels -- Magnetic Tape Th
Page 196 and 197: o (0) :.::: 4 (4) .,r- Continued Co
Page 198 and 199: 198 OS system Control Blocks (Relea
Page 200: 0(0) 4 (4) 16 (10) 36 (24) FL2RECFM
Page 203 and 204: Event Control Block The event contr
Page 206: INTERRUPTION CONTROL BLOCR 0(0) ICB
Page 209: Input/Output Block The input/output
Page 214: Offset Bytes and Field Alignment Na
Page 220: Offset Bytes and Field Alignment Na
Page 227 and 228: Offset 68 (44) 1 70 (46) •• 2 7
Page 232: Offset 101 (65) • 1 101 (65) •
Page 236 and 237: 236 OS System Control Blocks (Relea
Page 240: 240 os System Control Blocks (Relea
Page 245 and 246: Offset 40 (28) 2 40 (28) 41 (29) 42
Page 253 and 254: Offset 96 (60) 1 91 (61) • 3 100
Page 263: Offset I o (0) 8 8 (8) 3 *tes and ,
Page 268 and 269: Offset Bytes and Alignment I 24 (18
Page 274: Offset Bytes and Field A1ignment Na
Page 277 and 278: Offset Bytes and Field Alignment Na
Page 279 and 280: REQUEST BLOCKS -- MVT CONFIGURATION
Page 281 and 282: Interruption Request Block -- MVT T
Page 285: proqram Request Block -- MVT The pr
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Offset o (0) B 8 (8) 1 9 (9) • 1
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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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302 OS system Control Blocks (Relea
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Offset o 1 2 4 8 (0) 1 Bytes and Fi
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Bytes and Offset Alignment 105 (69)
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1-32 (20) r- L,. 0(0) 4 (4) 8 (8) 1
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Bytes and Field Offset Alignment Na
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1116 (74) 120 (78) 124 (7C) 128 (80
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Offset 31 (IF) 32 (20) Byte and Fie
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Offset 168 (AB) 4 172 (AC) 1 173 (A
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TIMING CONTROL TABLE 0(0) TCTQA 3 (
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Offset o (0) 3 Bytes and Field Alig
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Offset o 4 6 8 10 +0 (0) 4 (4) 2 By
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Offset +3 +4 +12 +15 +0 Bytes and F
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UCS 1403 Printer Extension 0(0) 4 (
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Offset 45 (2D) • 3 48 (30) 8 56 (
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Offset Bytes and Alignment 10 (A)
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MAGNETIC TAPE DEVICE CLASS UCBTYP B
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Byte 1 lOS Flogs I Model Code I UCB
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UCB + 16 (10) Offset 16 (10) 1 Byte
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ASCII Volume Header Label I 0 (0) 1
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Volume Table of Contents The volume
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Volume Table of Contents The volume
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Time-Sharing Option Control Blocks
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Driver Parameter Area The driver pa
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ENVIRONMENT CONTROL TABLE 0(0) ECTR
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Protected Step Control Block The pr
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Offset o (0) 7 Byte and Field Align
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Time-Sharing Job Block The time sha
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Indexes to system reference library
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liO coo.nter table 339 I/O lookup t
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