System Control Blocks

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Offset 52 (34) 1 52 (34) 4 56 (38) 4 60 (3C) 1 61 (3D) 1 62 (3E) 2 64 (40) 18 82 (52) 2 S4 (54) 4 Bytes and Field Alignment Name DC BOPI' CD 1 .•. .1 •. • . 1. DCBCHECK DCBSYNAD DCBFLAG 1 ••• .1 •• 11 •• •• xx xxxx DCBBLKSI DCBLRECL DCBCNTRL, DCBNOl'E, DCBPOINT DATA CONTROL BLOCK -- TCAM Field Description, Contents, Meaning APPLICATION PROGRAM EXTENSION (Continued) Option codes. Source or destination name precedes message (after control byte) (TCAM process queue). Work unit is a message. Default work unit is a record. (TCAM process queue). control byte precedes work unit (TCAM process queue) • Address of the CHECK module. Address of the user synchronizing routine. TeAM flag byte. value is X'SO' - STOP = QUICK was specified by the user. value is X'40' - STOP = FLUSH was specified by the user. value is X'CO' - STOP = BOTH was specified by the user. (Reserved bits) Reserved. Maximum block size. Reserved. 110 OS System Control Blocks (Release 21.7) Logical record length or block size. Address of CNTRL or the NOTE/POINT module.
Data Extent Blocks There are two kinds of data extent blocks -- an ordinary one, used in all access methods (including BTAM and the message control portion of QTAM), and another one used in the message processing portion of QTAM. Accordingly, separate diagrams and descriptions are presented for the following uses of DEBs: • Ordinary • QTAM Message Processing Program DEB 111
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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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Page 62: Device Interface 16 (10) Common Int
Page 66 and 67: Offset 16 (10) 1 11 (11) • 1 18 (
Page 68 and 69: Offset 40 (28) 8 48 (30) 1 49 (31)
Page 70 and 71: Offset Bytes and Field Alignment Na
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Page 76: Device Interface 16 (10) Common Int
Page 84: WTTA Interface 16 (10) DCBBQFLG Dat
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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 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 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 146 and 147: 146 OS System Control Blocks (Relea
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
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Offset 28 (lC) 29 (lD) • 1 Bytes
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Device Name Table The device name t
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164 OS System Control Blocks (Relea
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166 05 System Control Blocks (Relea
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10 (0) ....,r- 44 (2C) DS1FMTID For
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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
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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
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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 Bytes and Field Alignment Na
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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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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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