System Control Blocks

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- 36 (- 24) -32 (-20) -28 (+ lC) -24 (-18) -20 (-14) -16 (-10) -15 (-F) DEBWKARA I/O Support Work Area - 8 (-8) - 4 (- 4) o (0) DEBNMSUB 1 (1) DATA EXTENT BLOCK -- TCAM DEBEOEA Address of End-of-Extent Appendage DEBSIOA Address of 510 Appendage DEBPCIA Address of PCI Appendage DEBCEA Address af Channe I End Appendage DEBXCEA Address of Abnormal and Normal line End Appendage DEBDSCBA Address of DSCB DEBDCBMK DCB Modification Mask DEBlNGTH length of DEB in Dobulewords 4 (4) DEBAMlNG DEBAMlNG length of Access Method 15 (5) 8 (8) DEBTCBAD Address of the TC B DEBDEBAD Address of Next DEB DEBOFlG DEBOFlGS DEBIRB Data Set Flags 19 (9) Address of the IRB 12 (C) DEBOPATB DEBOPATB Type of I/O 113 (D) DEBSYSPG Address of First lOB in System Purge Chain 16 (10) DEBNMEXT DEBNMEXT DEBUSRPG Number of Extents 117 (11) Address of First lOB in User Purge Chain 20 (14) 121 (15) 24 (18) DEBPROTG DEBPROTG Protection Key DEB ID 125 (19) DEBPRIOR DEBECBAD Address of Parameter li st to Fi nd Purge EC B DEBDCBAD 28 (lC) DEBEXSCl DEBEXSCl Extent Scale 129 (10) DEBAPPAD Address of I/o AVT 32 (20) DEBDVMOD Reserved 133 (21) DEBUCBAD Address of UCB 35 (23) Figure 12C. Data Extent Block -- TCAM 134 OS System Control Blocks (Release 21.1>
Bytes and Offset Alignment -36 (-24) 4 -32 (-20) 4 -28 (-lC) 4 -24 (-18) 4 -20 (-14) 4 -16 (-10) 1 -15 (-F) • 7 -8 (-C) 4 -4 (-4) 4 o (0) 1 1 (1) • 3 +4 (4) u +5 (5) • 3 +8 (8) 1 +9 (9) • 3 +12 (C) 1 +13 (D) • 3 +16 (10) 1 +17 (iii • 3 +20 (14) 1 +21 (15) • 3 +24 (18) 1 +25 (19) • 3 +28 (lC) 1 +29 (10) • 3 +32 (20) 1 +33 (21) • 3 Name Field DEBEOEA DEBS lOA DEBPCIA OEBCEA DEBXCEA DEBWKARA DEBDSCBA DEBOCBMK IJEBLNG'l'H DEBNMSUB DEBTCBAD DEBAMING DEBDEBAD DEBOFLGS DEBIRBAD DEBOPATB 0011 xxxx •••• DEBSYSPG DEBNMEXT DEBUSRPG DEBPRIOR DEJ3ECBAO DEBPROTG xxxx • ••• 1111 DEBDCBAD DEBEXSCL DEBAPPAO DEBDVMOO DEBUCBAD DATA EXTENT BLOCK -- TCAM Field Description, Contents, Meaning Address of the end-ot-extent appendage routine. Address of the start I/O appendage routine. Address of the program-controlled-interruption routine. Address of the channel end appendage routine. Address of the abnormal normal line end appendage routine. I/O support work area. Address of the OSCB. DCB modification mask used by lOS support. Length of the DEB in doublewords. Number of subroutines loaded by the OPEN routine. Address of the TCB. Length of the access method section in doublewords. Address of the next DEB Data set flags. These flags are the same (when applicable) as they are in the ordinary DEB. Address of the IRB. Type of I/O. INPUT (Reserved bits). Address of first lOB in the system purge chain. Number of extents for message queue and checkFoint data sets. Address of the first lOB in the user purge chain. priority of the task; always zero for TCAM. Address of the parameter list used to locate the purge ECB for an SVC purge request. Protection key DEB ID. Protection key. A hexadecimal "F" to identify this block as a DEB • Address of the DCB. Extent scale: 4 for direct access device and 2 for teleprocessing device. Address of the I/O appendage vector table. Reserved. Address of the UCB. DEB -- TCAM 135
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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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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
Page 107 and 108: Offset 33 (21) • 3 36 (24) 1 37 (
Page 110 and 111: Offset 52 (34) 1 52 (34) 4 56 (38)
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 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 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 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
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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 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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