System Control Blocks

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198 OS system <strong>Control</strong> <strong>Blocks</strong> (Release 21.7>
DATA SET LABEL 2 -- FL2 Data set label 2 immediately follows data set label 1 and is written in the same code as data set label 1. It is 80 characters in length and contains information about the data set, in addition to that in data set label 1. On an ASCII tape, data set label 2 is optional during input and required during output. Figure 16B shows the format of data set label 2. Descriptions of the fields follow the illustration. Data Set Label 2 -- FL2 199
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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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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 164 and 165: 164 OS System Control Blocks (Relea
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
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 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 238 and 239: JOB STEP CONTROL BLOCK 240 (FO) JSC
Page 240: 240 os System Control Blocks (Relea
Page 245 and 246: Offset 40 (28) 2 40 (28) 41 (29) 42
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Offset 96 (60) 1 91 (61) • 3 100
Page 256 and 257:
Page 263:
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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Page 274:
Offset Bytes and Field A1ignment Na
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Page 279 and 280:
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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Page 314 and 315:
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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