System Control Blocks

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MAGNETIC TAPE DEVICE CLASS UCBTYP Byte 1 Byte 2 Byte 3 Byte 4 lOS Flags I Model Code I Optional Features I [\evice Class I Unit Type UCB + 16 (10) 17 (11) 18 (12) 19 (13) Bytes and Bit and Hex. Offset Alignment state Dig. Field Description, Contents, Meaning Byte 1 16 (10) 1 xxxx O ••• I/O supervisor flags. (Reserved tit) • 1 •• .. 1. Overrunable device • Burst mode • •• 0. Byte mode • • •• 1 xxxx Data chaining. Model code. x.xx .1 .. (Reserved tits) Phase-encode code (Models 4, 5, 6, 1) 11 (11) · 18 (12) · 19 (13) · 1 Byte 2 Optional features. 1 ••• 1-track compatibility (2400, 3400). .1 •. Data conversion (2400, 3400) • . 1 . . 1 • .1. • •• x xxxx Byte 3 Byte 4 80 01 Dual-density (2400, 3400). (Reserved hits) Device Class. MagnetiC tape. Unit type. 2400 series magnetic tape device. 03 3400 series magnetic tape device. UCB 369
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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
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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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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
Page 316 and 317: Bytes and Field Offset Alignment Na
Page 322 and 323: 322 OS System Control Blocks (Relea
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
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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 370 and 371: DIRECT ACCESS STORAGE DEVICE CLASS
Page 373 and 374: Offset Bytes and Alignment 24 (18)
Page 377 and 378: Offset Bytes and Alignment COMMUNIC
Page 379: Volume Label A volume label is 80 c
Page 384 and 385: VTOC Data Set User Label Extent* or
Page 391 and 392: Environment Control Table The envir
Page 394 and 395: 394 os System Control Blocks (Relea
Page 396 and 397: 0(0) 8 (8) PROTECTED STEP CONTROL B
Page 402: Offset 26 (lA) •• 1 Byte and Fi
Page 405: Time-Sharing Interface Area The tim
Page 413: User Profile Table The user profile
Page 416 and 417: data event control block 137 BDAM 1
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IBM System/360 Operating System: GC
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