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DATA CONTROL BLOCK -- SAM<br />
Continued<br />
----aSiM---;;.cC-e-ss--M-ethod--I-n-terface-------------------------------------------------------------------------------------------------------------------------------------------------<br />
49 (31)<br />
DCBGET, DCBPUT<br />
Address of GET or PUT Module<br />
52 (34) 53 (35)<br />
DCBOPTCD DCBGERR, DCBPERR<br />
Option Codes Address of Synchronizing Routine<br />
56 (38)<br />
60 (3C)<br />
57 (39)<br />
DCBIOBL<br />
DCBSYNAD<br />
lOB Length Address of User's Synchronizing Routine<br />
OCBCINDI<br />
61 (3D)<br />
DCBCIND2<br />
62 (3E)<br />
DCBBLKSI<br />
Condition Flags Condition Flags Maximum Block Size<br />
64 (40) 65 (41) 66 (42) 67 (43)<br />
OCBWCPO DC BWCPL OCBOFFSR DCBOFFSW<br />
Write Channel Program Offset Write Channel Program Length Read CCW Offset Wri te CCW Offset<br />
68 (44)<br />
72 (48\<br />
76 (4C)<br />
DCBIOBA<br />
Address of lOB Prefix (When Normal Scheduling is Used)<br />
DCBEOBAD, DCBLCCW<br />
Address of End of Buffer or of Last CCW in List<br />
DCBRECAD, DCBCCCW<br />
Address of Current or Next Logi co I Record or CCW<br />
80 (50) 81 (51) DCBUFOF 82 (52)<br />
DCBQSWS Block Prefix Length DCBLRECL<br />
DCBUSASI (Flags) 81 (51) DCBDIRCQ Logical Record Length or Block Size<br />
Directory Count<br />
84 (54)<br />
DCBEROPT<br />
85 (55)<br />
DCBCNTRL<br />
Error Option Flags Address of CNTRL<br />
88 (58) 90 (5A)<br />
DCBPRECL<br />
Reserved Physical Record Length<br />
92 (5C)<br />
DCBEOB<br />
Address of End-of-Block Module<br />
, ,<br />
1 ____ .. ____________________________________ '-_____________________________ ... ____ .... ______________ ... __ ...... ___________ .. ______________ .. _ .. ___________________________________________ .. ________________ .. ___ ..... ___ .. ______ f<br />
Figure SC. Data <strong>Control</strong> Block - QSAM, BSAM, BPAM, EXCP - Access Method Segments<br />
(Part 2 of 2)<br />
44 OS <strong>System</strong> <strong>Control</strong> <strong>Blocks</strong> (Release 21.7)<br />
95 (5F)
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