System Control Blocks

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0(0) DATA EVENT CONTROL BLOCK -- BSAM DECSDECB Event Control Block 4 (4) 6 (6) DECTYPE, DECBPTR DECLNGTH Type of I/O Request or Address of next DECB Length of Key and Data 8 (8) 12 (C) 16 (10) 20 (14) DECDCBAD Address of DCB DECAREA Address of Key Data or of user specified channel program DECIOBPT Address of lOB DEC NEXT Address of the Next Address Feedback Field Figure 13A. Data Event Control Block -- BSAM Offset o (0) 4 4 (4) 4 4 (4) 2 4 (4) 5 (5) Bytes and Alignment 6 (6) •• 2 8 (8) 4 Name Field DECSDECB DECBPTR DECTYFE Byte l 1 ••• .xxx xxxx Byte 2 1 ••• .1 •• •• 1. .•. 1 x.x .1 •• •• 1. ••• 1 DECLNGTH DECDCBAD DATA EVENT CONTROL BLOCK -- BSAM Field Description, Contents, Meaning Event control block. 23 (17) For IBM 1419 Magnetic Character Reader and IBM 1215 Optical Reader Sorter: A pointer to the next DECB to be tested for completion by the CHECK macro instruction. (DECB chaining applies to the use of more than one device.) This field in the last DECB must be zero. For other than IBM 1419 Magnetic Character Reader and IBM 1275 Optical Reader sorter: Type of I/O request. Type of length operand: S coded for length. (Reserved bits) Type of operation: READ SF READ SB WRITE SF WRITE SO (Reserved bits) WRITE SZ WRITE SFR 140 OS System Control Blocks (Release 21.7) Length of key and data. Address of the DCB to which this I/O request is related.
Offset 12 (e) 4 16 (10) 4 20 (14) 4 20 (14) 1 21 (15) • 3 Bytes and Alignment Name Field DECAREA DECIOBPT DECNEXT DATA EVENT CONTROL BLOCK -- BSAM Field Description, Contents, Meaning Address of the key and data, or for 1287 or 1288 optical readers, the address of a user specified channel program. Address of the lOB. Reserved. Address of the next address feedback field. Present only if R is coded in the WRITE macro. DECB -- BSAM 141
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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 (
Page 90 and 91: 90 OS System Control Blocks (Releas
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: DATA EVENT CONTROL BLOCK -- BSAM Th
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 and 154: DATA EVENT CONTROL BLOCK -- BTAM Th
Page 157 and 158: Offset Bytes and Field Alignment Na
Page 159 and 160: Offset 28 (lC) 29 (lD) • 1 Bytes
Page 161: Device Name Table The device name t
Page 166 and 167: 166 05 System Control Blocks (Relea
Page 168: 10 (0) ....,r- 44 (2C) DS1FMTID For
Page 177 and 178: 72 (48) FORMAT 2 -- INDEX DATA SET
Page 179 and 180: Offset 64 (40) 2 Bytes and Alignmen
Page 181 and 182: FORMAT 3 -- EXTENSION DATA SET CONT
Page 185 and 186: Offset o (OJ 44 44 (2C) 1 45 (2D)
Page 188: ...... ---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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Offset 68 (44) 1 70 (46) •• 2 7
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Offset 101 (65) • 1 101 (65) •
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236 OS System Control Blocks (Relea
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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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Offset 40 (28) 2 40 (28) 41 (29) 42
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Offset 96 (60) 1 91 (61) • 3 100
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Offset I o (0) 8 8 (8) 3 *tes and ,
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Offset Bytes and Alignment I 24 (18
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Offset Bytes and Field A1ignment Na
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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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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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System Control Blocks

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