System Control Blocks

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0(0) 4 (4) 8 (8) 12 (C) 16 (10) 20 (14) DATA EVENT CONTROL BLOCK -- BISAM DECBECB Event Control Block 5 (5) 6 (6) DECBTYPI DECBTYP2 DECBLGTH Options Type of I/o No. of Bytes Read or Written 24 (18) DECBEXCI 25 (19) DECBEX2 Exceptional Condition Codes Exceptional Condition Codes DECBDCBA Address of DCB DECBAREA Storage Address for Record DECBLOGR Address of Logical Record DECBKEY Address of Key Portion of Record Figure 13B. Data EVent Control Block -- BISAM 144 OS System Control Blocks (Release 21.7)
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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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Page 94: 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)
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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
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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: DATA EVENT CONTROL BLOCK -- BlSAM T
Page 147 and 148: DATA EVENT CONTROL BLOCK -- BDAM Th
Page 150 and 151: Bytes and Offset Alignment 6 (6) .
Page 152 and 153: DATA EVENT CONTROL BLOCK -- QTAM 0(
Page 154: 0(0) 4 (4) 8 (8) 12 (C) DATA EVEN!'
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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
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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
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Page 192 and 193: FORMAT 6 -- SHARED EXTENT DATA SET
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194 OS System Control Blocks (Relea
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Offset o (0) 3 Bytes and Field Alig
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DATA SET LABEL 2 -- FL2 Data set la
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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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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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