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Appendage Table<br />
DATA EXTENT BLOCK -- ORDINARY<br />
-36 (-24) DEBEOEA (1)<br />
Address of End-of-Extent Appendage<br />
-32 (-20) DEBSIOA (1)<br />
Address of Start I/O Appendage<br />
-28 (-lC) DEBPCIA(1 )<br />
Address of PCI Appendage<br />
-24 (-18) DEBCEA (1)<br />
Address of Channel-End Appendage<br />
-20(-14) DEBXCEA (1)<br />
Address of Abnormal-End Appendage<br />
DEB Prefix<br />
-16 (-10) DEBWKARA -15 (-F)<br />
I/o Support Work Area<br />
DEBDSCBA<br />
Address of DSCB<br />
-8 (-8) DEBDCBMK<br />
DCB Modification Mask<br />
-4 (-4) DEBLNGTH -3 (-3)<br />
Length of DEB Reserved<br />
Basic Section<br />
0(0) DEBNMSUB 1 (1) DEBTCBAD<br />
No. of Subroutines Address of TCB<br />
4 (4) DEBAMLNG 5 (5) DEBDEBAD<br />
Acc M S In Length Address of Next DEB<br />
8 (8) DEBOFLGS 9 (9) DEBIRBAD<br />
Data Set Status Address of I RB<br />
12 (C) DEBOPATB 13 (D) DEBQSCNT 14 (E) DEBFLGSI 15 (F)<br />
Type of I/o PURGE - Quiesce Count AFlag Reid Reserved<br />
16 (10) DEBNMEXT 17 (11) DEBUSRPG<br />
No. of Extents Address of First lOB in User Purge Chain<br />
20 (14) DEBPRIOR 21 (15) DEBECBAD<br />
Priority Address of Parameter List to Find Purge ECB<br />
24 (18) DEBPROTG, DEBDEBID 25 (19) DEBDCBAD<br />
Protection Key, DEB Id Address of DCB<br />
28 (lC) DEBEXSCL 29 (10) DEBAPPAD<br />
Extent Scale Address of I/O Appendage Vector Table<br />
(1) Field names used only in BTAM and parts of QTAM.<br />
Figure 12. Data Extent Block -- Ordinary (Part 1 of 5)<br />
114 OS <strong>System</strong> <strong>Control</strong> <strong>Blocks</strong> (Release 21.7)<br />
-17(-11)<br />
-1 (-1)<br />
31 (IF)
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