System Control Blocks

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Continued 40 (28) 44 (2C) 48 (30) 52 (34) 56 (38) BISAM Mode Section 0(0) 4 (4) DATA EXTENT BLOCK -- ORDINARY DEBASETl Address of SETL Abend Appendage DEBAWRIT Address of Write Abend Appendage DEBACHK Address of Write Validity Check Abend Appendage DEBAREWT Address of Rewrite Abend Appendage DEBARECK Address of Re-check Abend Appendage DEBDISAD Address of Privileged Module DEBWKPT4 Address of Part 1 Appendage Module 8 (8) DEBWKPT5 I Address of Part 2 Appendage Module I I 12 (C) 16 (10) DEBFREED Address of Dynamic Buffering Module DEBRPSIO ! I I I I I I Address of RPS S 10 Appendage Module I 19 (13) I I L ___________________________________________________________ -1 Subroutine Nome Section +0 DEBSUBID Subroutine ID +1 Figure 12. Data Extent Block -- Ordinary (Part 5 of 5) 118 OS System Control Blocks (Release 21.7)
offset -36 (-24) 4 -32 (-20) 4 -28 (-lC) 4 -24 (-18) 4 -20 (-14) 4 -36 (-24) 4 -32 (-20) 4 -28 (-lC) 4 -24 (-18) 4 -20 (-14) 4 -i6 (-iO; i -15 (-F) • 7 -8 (-8) 4 -4 (-4) 1 -3 (-3) • 3 Bytes and Field Alignment Name (End of Extent) (Start I/O) (PCI) (Channel End) (Abnormal End) DEBEOEA DEBSIOA DEBPCIA DEBCEA DEBXCEA DEBWKARA DEBDSCBA DEBDCBMK DEBLNGTH DATA EXTENT BLOCK -- ORDINARY Field Description, Contents, Meaning APPENDAGE TABLE BSAM, QSAM, BPAM, BDAM, GAM Address of the end-of-extent appendage routine. Address of the start I/O appendage routine. Address of the program-controlled-interruption appendage routine. Address of the channel-end appendage routine. Address of the abnormal-end appendage routine. BTAM, QTAM MESSAGE CONTROL Address of the end-of-extent appendage routine. Address of the start I/O appendage routine. Address of the program-controlled-interruption appendage routine. Address of the channel-end appendage routine. Address of the abnormal-end appendage routine. END OF APPENDAGE TABLE PREFIX SECTION DIRECT-ACCESS STORAGE DEVICES I/O support work area. DSCB address (BBCCHHR) used by I/O support. ALL DEVICES DCB modification mask used by I/O support. Length of DEB in double words. Reserved. DEB 119
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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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Page 68 and 69: Offset 40 (28) 8 48 (30) 1 49 (31)
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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 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 124: Offset +0 +0 +0 +1 +0 +4 +8 +0 +4 +
Page 127: DATA EXTENT BLOCK -- QTAM MESSAGE P
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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 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
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Page 161: Device Name Table The device name t
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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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174 OS System Control Blocks (Relea
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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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System Control Blocks

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