System Control Blocks

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382 OS System Control Blocks (Release 21.7)
Volume Table of Contents The volume table of contents (VTOC) is a data set consisting of data set control blocks (DSCB). The format of the VTOC, and its relation to user labels, is shown in Figure 31. A description follows the illustration. (The DSCBs are describes separately, under that heading, in this publication. ) VTOC 383
Page 1:
Systems Reference Library IBM Syste
Page 6 and 7:
Figures Figure 1A. Pointer Diagram
Page 11:
System Control Blocks System contro
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. ..J MFT Figure lA. Pointer Diagra
Page 17 and 18:
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
Page 32 and 33:
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0(0) 4 (4) 8 (8) 12 (c) 16 (10) 20
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Page 44:
DATA CONTROL BLOCK -- SAM Continued
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Offset 53 (35) • 3 56 (38) 1 57 (
Page 62:
Device Interface 16 (10) Common Int
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Offset 16 (10) 1 11 (11) • 1 18 (
Page 68 and 69:
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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Page 81 and 82:
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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
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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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Page 124:
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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Page 139 and 140:
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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Page 159 and 160:
Offset 28 (lC) 29 (lD) • 1 Bytes
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Device Name Table The device name t
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Page 166 and 167:
166 05 System Control Blocks (Relea
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10 (0) ....,r- 44 (2C) DS1FMTID For
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Page 177 and 178:
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
Page 185 and 186:
Offset o (OJ 44 44 (2C) 1 45 (2D)
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...... ---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
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
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Page 220:
Page 227 and 228:
Offset 68 (44) 1 70 (46) •• 2 7
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Offset 101 (65) • 1 101 (65) •
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Page 238 and 239:
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
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
Page 277 and 278:
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
Page 291 and 292:
Offset o (0) B 8 (8) 1 9 (9) • 1
Page 293 and 294:
Supervisor Request Blocks -- MVT Th
Page 295 and 296:
Supervisor Request Block -- MVT --
Page 297 and 298:
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
Page 309 and 310:
Bytes and Offset Alignment 105 (69)
Page 312 and 313:
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
Page 322 and 323:
Page 325 and 326:
1116 (74) 120 (78) 124 (7C) 128 (80
Page 328 and 329:
Offset 31 (IF) 32 (20) Byte and Fie
Page 331: Offset 168 (AB) 4 172 (AC) 1 173 (A
Page 334 and 335: TIMING CONTROL TABLE 0(0) TCTQA 3 (
Page 337 and 338: Offset o (0) 3 Bytes and Field Alig
Page 339 and 340: Offset o 4 6 8 10 +0 (0) 4 (4) 2 By
Page 344: Offset +3 +4 +12 +15 +0 Bytes and F
Page 352: UCS 1403 Printer Extension 0(0) 4 (
Page 357: Offset Bytes and Field Alignment Na
Page 360: Offset 45 (2D) • 3 48 (30) 8 56 (
Page 364: Offset Bytes and Alignment 10 (A)
Page 369 and 370: MAGNETIC TAPE DEVICE CLASS UCBTYP B
Page 371: Byte 1 lOS Flogs I Model Code I UCB
Page 374: UCB + 16 (10) Offset 16 (10) 1 Byte
Page 378 and 379: 378 OS System Control Blocks (Relea
Page 381: ASCII Volume Header Label I 0 (0) 1
Page 385 and 386: Volume Table of Contents The volume
Page 387 and 388: Time-Sharing Option Control Blocks
Page 389: Driver Parameter Area The driver pa
Page 392: ENVIRONMENT CONTROL TABLE 0(0) ECTR
Page 395 and 396: Protected Step Control Block The pr
Page 397 and 398: Offset o (0) 7 Byte and Field Align
Page 399: Time-Sharing Job Block The time sha
Page 415 and 416: Indexes to system reference library
Page 417: liO coo.nter table 339 I/O lookup t
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