System Control Blocks

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Offset 96 (60) 1 91 (61) • 3 100 (64) 12 112 (70) 1 113 (11) • 1 120 (78) 24 141 (80) • 3 144 (90) 8 Bytes and Field Alignment Name LCBERMSK LCBINVPT LCBTPCD LCBSNSV LCBCSWSV LCBERCa-'l LCBSTICS LCBCPA LINE CONTROL BLOCK -- TeAM Field Description, Contents, Meaning Error recording mask. Address of the current entry in the invitation list. Teleprocessing operation codes. Save area for sense byte. Save area for CSW. Three ERP commands. Characteristics work area. Variable length channel progam area. Note: The following extension resides immediately after the variable length channel program area. o (0) 1 LCDXFLAG 1 •.• 1111 .111 .1 .. 1111 1.11 •• 1. 1111 11.1 1 (1) 3 LCBXOCT 4 (4) 1 LCBPCIRC 5 (5) 3 LCBXRADR Device dependent flags. LCBGPCTV LCBGPSTP LCBSRCPRF LCBSRSTP LCBERPND LCBERSTP OCT storage area. 3210 local PCI retry counter. Error poll characters address. LCB -- TCAM 253
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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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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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Offset 28 (lC) 29 (lD) • 1 Bytes
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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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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
Page 196 and 197: o (0) :.::: 4 (4) .,r- Continued Co
Page 198 and 199: 198 OS system Control Blocks (Relea
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 236 and 237: 236 OS System Control Blocks (Relea
Page 238 and 239: JOB STEP CONTROL BLOCK 240 (FO) JSC
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Page 245 and 246: Offset 40 (28) 2 40 (28) 41 (29) 42
Page 254: 254 05 System Control Blocks (Relea
Page 257: PARTITIONED DATA SET DIRECTORY ENTR
Page 265: PARTITIONED DATA SET DIRECTORY ENTR
Page 269 and 270: Request Blocks Request blocks are u
Page 271: REQUEST BLOCR -- MFT CONFIGURATIONS
Page 276 and 277: Offset 12 (e) 4 12 (e) 1 13 (D) •
Page 282: INTERRUPTION REQUEST BLOCK -- MVT 0
Page 288: 288 os system Control Blocks (Relea
Page 292 and 293: 292 OS system Control Blocks (Relea
Page 296 and 297: 0(0) SUPERVISOR REQUEST BLOCK -- MV
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SYSTEM MANAGEMENT CONTROL AREA 0(0)
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Task Control Block -- MFf Figure 26
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1116 (74) 120 (78) 124 (7C) 128 (80
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Offset 28 (lC) 1 29 (10) • 5 29 (
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Task Control Block -- MVT Figure 26
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Byte and Field Offset Alignment Nam
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Offset 33 (21) Byte and Alignment 3
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Timing Control Table The timing con
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Processor Storage Table I +0(0) +4(
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Offset +0 +2 +3 +4 +0 4 +4 1 +5 •
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346 as System Control Blocks (Relea
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Offset 24 (18) 4 Bytes and Field Al
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Offset 152 (98) 16 16S (AS) 16 184
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Offset 16 (10) 11 (11) 18 (12) 19 (
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DIRECT ACCESS STORAGE DEVICE CLASS
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Offset Bytes and Alignment 24 (18)
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Offset Bytes and Alignment COMMUNIC
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Volume Label A volume label is 80 c
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VTOC Data Set User Label Extent* or
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Environment Control Table The envir
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394 os System Control Blocks (Relea
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0(0) 8 (8) PROTECTED STEP CONTROL B
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Offset 26 (lA) •• 1 Byte and Fi
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Time-Sharing Interface Area The tim
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User Profile Table The user profile
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data event control block 137 BDAM 1
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IBM System/360 Operating System: GC
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System Control Blocks

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