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Offset<br />
80 (50) 1<br />
81 (51) • 1<br />
82 (52) •• 2<br />
84 (54) 4<br />
88 (58) 4<br />
92 (SC) 4<br />
96 (60) 4<br />
100 (64) 4<br />
104 (68) 4<br />
108 (6C) 4<br />
112 (70) 1<br />
113 (71) • 7<br />
120 (78) 5<br />
125 (7D) • 7<br />
132 (84) 5<br />
137 (89) • 1<br />
Bytes and Field<br />
Alignment Name<br />
DCBEXCDl<br />
1 •..<br />
• 1 •.<br />
.. 1.<br />
.•. 1<br />
1 •••<br />
. 1 ••<br />
.. 1.<br />
.•. 1<br />
DCBEXCD2<br />
1 •••<br />
. 1 •.<br />
• • 1.<br />
••. 1<br />
1 •..<br />
• xxx<br />
DCBLRECL<br />
DCBESETL<br />
DCBLRAN<br />
DCBLWKN<br />
DCBRELSE<br />
DCBPUTX<br />
DCBRELX<br />
DCBFREED<br />
DCBHIRTI<br />
DCBFTMI2<br />
DCBLEMI2<br />
DCBFTMI3<br />
DCBLIMI3<br />
DCBNLEV<br />
DATA CONTROL BLOCK -- ISAM<br />
Hex.<br />
Dig. Field Description, Contents, Meaning<br />
ACCESS METHOD INTERFACE -- ISAM (Continued)<br />
First byte in which exceptional conditions detected<br />
in processing data records are reported to the user.<br />
Lower key limit not found.<br />
Invalid device address for lower limit •<br />
Space not found •<br />
Invalid request •<br />
Uncorrectable input error.<br />
Uncorrectable output error •<br />
Block could not te reached (input) •<br />
Block could not be reached (update) •<br />
Second byte in which exceptional conditions detected<br />
in processing data records are reported to the user.<br />
Sequence check.<br />
Duplicate record •<br />
DCB closed when error was detected •<br />
Overflow record •<br />
PUT: length field of recQrd larger than length<br />
indicated in DCBLRECL.<br />
(Reserved bits)<br />
Logical record length for fixed-length record<br />
formats.<br />
Variable-length record formats:<br />
Maximum logical record length or an actual logical<br />
record length changed dynamically by the user when<br />
creating the data set.<br />
Address of the ESETL routine in the GET module.<br />
Address of READ-WRITE K module or exclusive module.<br />
Address of WRITE KN module.<br />
Work area for temporary storage of register contents.<br />
Work area for temporary storage of register contents.<br />
Address of read exclusive module.<br />
Address of dynamic buffering module.<br />
Number of index entries that fit on a prime data<br />
track.<br />
Direct access device address of the first track of<br />
the second level master index (in the form MBBCCHH).<br />
Direct access device address of the last active entry<br />
in the second level master index (in the form CCHHR).<br />
Direct access device address of the first track of<br />
the third level master index (in the form MBBCCHH).<br />
Direct access device address of the last active entry<br />
in the third level master index (in the form CCHHR).<br />
Number of levels of in1ex.<br />
DCB -- ISM 71
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