System Control Blocks

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0(0) 4 (4) 8 (8) 12 (C) DATA EVEN!' CONTROL BLOCK -- BTAM DECSDECB Event Control Block DECTYPE 6 (6) DECLNGTH Programming, Indicators, Code Buffer Length, Message Area Length DECBUFCT 9 (9) DECDCBAD Buffer Count DCB Address DECAREA Buffer Address, Message Area Address 16 (10) 17 (11) 18 (12) DECSENSO DECSENS 1 DECCOUNT Sense Byte Reserved CSW Residual Count 20 (14) 24 (18) 28 (1C) 32 (20) 36 (24) DECCMCOD, DECENTRY Error Command, Terminal List Address DECFLAGS 25 (19) DECRLN 26 (lA) DECRESPN Operations Status Relative Line No. Addressing Response, VRC/LRC Response DECTPCOD 29 (lD) DECERRST 30 (lE) DECCSWST Operation I/O Error Status CSW Status DECADRPT Address of Previous Entry in Addressing List DECPOLPT Contents Depend on Use of Autopoll; Programmed Poll ing; or sse sse Extension 40 (28) 42 (2A) DECWLNG Reserved Length of Data Area or of Tone Character Area 44 (2C) Figure 13E. Data Event Control Block -- BTAM 154 os System Control Blocks (Release 21.7) DECWAREA Address of Data Area or of Area Containing the Tone Characters 47 (2F)
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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
Page 103: DATA CONTROL BLOCK -- TCAM The form
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Page 110 and 111: Offset 52 (34) 1 52 (34) 4 56 (38)
Page 112 and 113: 112 OS System Control Blocks (Relea
Page 114: Appendage Table DATA EXTENT BLOCK -
Page 119 and 120: offset -36 (-24) 4 -32 (-20) 4 -28
Page 121 and 122: Offset Bytes and Field Alignment Na
Page 124: Offset +0 +0 +0 +1 +0 +4 +8 +0 +4 +
Page 127: DATA EXTENT BLOCK -- QTAM MESSAGE P
Page 131 and 132: Offset 48 (30) 4 52 (34) 1 53 (35)
Page 134 and 135: - 36 (- 24) -32 (-20) -28 (+ lC) -2
Page 136: 136 OS System Control Blocks (Relea
Page 139 and 140: DATA EVENT CONTROL BLOCK -- BSAM Th
Page 141 and 142: Offset 12 (e) 4 16 (10) 4 20 (14) 4
Page 143 and 144: DATA EVENT CONTROL BLOCK -- BlSAM T
Page 148: o (0) DATA EVENT CONTROL BLOCK -- B
Page 151 and 152: DATA EVENT CONTROL BLOCK -- QTAM Th
Page 153: DATA EVENT CONTROL BLOCK -- BTAM Th
Page 158 and 159: Offset 28 (1C) Bytes and Field Alig
Page 160 and 161: Offset Bytes and Field Alignment Na
Page 163 and 164: Offset o (0) 4 +0 8 +8 +8 4 +8 2 By
Page 165 and 166: Data Set Control Blocks The data se
Page 167 and 168: FORMAT 1 -- IDENTIFIER DATA SET CON
Page 170: Offset o (0) 44 44 (2C) 1 45 (20)
Page 175: FORMAT 2 -- INDEX DATA SF!' CONTROL
Page 178 and 179: 1 Offset o 1 8 13 20 25 36 (0) 1 By
Page 180 and 181: 180 OS System control Blocks (Relea
Page 182: 44 (2C) DS3FMTlD Format Identifier
Page 186: Offset Bytes and Alignment (44) 2 D
Page 192 and 193: FORMAT 6 -- SHARED EXTENT DATA SET
Page 194: 194 OS System Control Blocks (Relea
Page 197 and 198: Offset o (0) 3 Bytes and Field Alig
Page 199 and 200: DATA SET LABEL 2 -- FL2 Data set la
Page 202 and 203: Offset 36 (24) 1 37 (2S) • 1 38 (
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Offset +1 Bytes and Field Alignment
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Offset 16 (10) 7 17 (11) • 7 24 (
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INPUT/OUTPUT BLOCK Extension (Conti
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Offset 28 (lC) 1 29 (lC) • 1 28 (
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Offset 51 (33) 52 (34) 4 56 (38) 2
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Offset 79 (4F) 80 (50) 3 Bytes and
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Offset 113 (71) • 1 114 (72) •
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Job Step Control Block The job step
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Offset 240 (FO) 3 243 (F3) .1 244 (
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LINE CONTROL BLOCK Line Control Blo
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Offset 72 (48) 4 76 (4C) 2 78 (4E)
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254 05 System Control Blocks (Relea
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PARTITIONED DATA SET DIRECTORY ENTR
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PARTITIONED DATA SET DIRECTORY ENTR
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Request Blocks Request blocks are u
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REQUEST BLOCR -- MFT CONFIGURATIONS
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Offset 12 (e) 4 12 (e) 1 13 (D) •
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278 OS System Control Blocks (Relea
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INTERRUPTION REQUEST BLOCK -- MVT 0
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288 os system Control Blocks (Relea
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292 OS system Control Blocks (Relea
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0(0) SUPERVISOR REQUEST BLOCK -- MV
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SYSTEM MANAGEMENT CONTROL AREA 0(0)
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Task Control Block -- MFf Figure 26
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1116 (74) 120 (78) 124 (7C) 128 (80
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Offset 28 (lC) 1 29 (10) • 5 29 (
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Task Control Block -- MVT Figure 26
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Byte and Field Offset Alignment Nam
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Offset 33 (21) Byte and Alignment 3
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Timing Control Table The timing con
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Processor Storage Table I +0(0) +4(
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Offset +0 +2 +3 +4 +0 4 +4 1 +5 •
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346 as System Control Blocks (Relea
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Offset 24 (18) 4 Bytes and Field Al
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Offset 152 (98) 16 16S (AS) 16 184
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Offset 16 (10) 11 (11) 18 (12) 19 (
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DIRECT ACCESS STORAGE DEVICE CLASS
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Offset Bytes and Alignment 24 (18)
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Offset Bytes and Alignment COMMUNIC
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Volume Label A volume label is 80 c
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VTOC Data Set User Label Extent* or
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Environment Control Table The envir
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394 os System Control Blocks (Relea
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0(0) 8 (8) PROTECTED STEP CONTROL B
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Offset 26 (lA) •• 1 Byte and Fi
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Time-Sharing Interface Area The tim
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User Profile Table The user profile
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data event control block 137 BDAM 1
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IBM System/360 Operating System: GC
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System Control Blocks

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