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Device Interface<br />
16 (10)<br />
Common Interface<br />
20 (14)<br />
24 (18)<br />
28 (lC)<br />
DATA CONTROL BLOCK -- ISAM<br />
DCBKEYLE<br />
17 (11)<br />
DCBDEVT<br />
18 (12)<br />
DCBTRBAL<br />
Key Length Device Type Track Balance<br />
DCBBUFNO<br />
21 (15)<br />
DCBBUFCB<br />
Buffer Required Address of the Buffer Pool<br />
Foundation Extension<br />
DCBBUFL<br />
Buffer Length<br />
32 (20) 33 (21)<br />
DCBHIARC, DCBBFTEK, DCBBFALN<br />
36 (24)<br />
DCBRECFM<br />
Record Format<br />
37 (25)<br />
Reserved<br />
26 (lA)<br />
DCBEODAD<br />
Address of EODAD Routine<br />
DCBEXLST<br />
Address of the Exit List<br />
DCBDSORG<br />
Data Set Organization<br />
Foundation<br />
----S-efore--O-PE-N------------------------------------------------------------------------------------------- ---------------------------------------------------------------------------------<br />
40 (28)<br />
48 (30)<br />
After OPEN<br />
40 (28)<br />
DCBDDNAM<br />
DD Statement Data Set Name<br />
49 (31)<br />
50 (32)<br />
DCBOFLGS<br />
DCBIFLG<br />
DCBMACR<br />
Open Routine Flags I/o Supervisor Flags Macro Instruction Code<br />
44 (2C)<br />
DCBIFLGS<br />
I/o Supervisor Flags<br />
48 (30)<br />
DCBOFLGS<br />
Open Routine Flags<br />
DCBTIOT<br />
Offset in TIOT Table to DD Entry<br />
Access Method Interface - ISAM<br />
52 (34)<br />
56 (38)<br />
DCBOPTCD<br />
45 (2D)<br />
49 (31)<br />
53 (35)<br />
DCBMAC<br />
42 (2A)<br />
-<br />
54 (36)<br />
DCBDEBAD<br />
Address of the DEB<br />
DCBGET, DCBPUT<br />
Address of GET or PUT Module<br />
DCBNTM<br />
DCBMACRF<br />
Macro Instruction Code<br />
55 (37)<br />
DCBCYLOF<br />
Option Code DCBMACRF Overflow Index Size No. of Overflow Tracks<br />
DCBSYNAD<br />
Address of User's Synchronous Error Routi ne<br />
60 (3C)<br />
DCBRKP<br />
Relative Ke y<br />
162 (3E)<br />
DCBBLKSI<br />
n __ !J..! B!ock Size<br />
rOSlTlOn<br />
Figure 6. Data <strong>Control</strong> Block - ISAM (part 1 of 4)<br />
62 OS <strong>System</strong> <strong>Control</strong> <strong>Blocks</strong> (Release 21.1)<br />
51 (33)<br />
19 (13)<br />
31 (IF)<br />
39 (27)<br />
Continued
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