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I<br />
Offset<br />
11 (11) • 1<br />
18 (12) •• 1<br />
Bytes and Field<br />
Alignment Name<br />
19 (13) ••• 1<br />
20 (14) 1<br />
21 (15) • 3<br />
24 (18) 2<br />
26 (lA) •• 2<br />
26 (lA)<br />
21 (lB)<br />
28 (lC) 4<br />
28 (lC) 1<br />
28 (lC) 1<br />
29 (10) • 3<br />
DCBUEVT<br />
0100 1111<br />
0101 1101<br />
0101 1111<br />
DCBAPPIN<br />
DCBBUFNO<br />
DCBBUFCB<br />
DCBBUFL<br />
DCBDSORG<br />
Byte 1<br />
1 •••<br />
. 1 ••<br />
•• 1.<br />
••• x xx ••<br />
•• 1.<br />
.•• 1<br />
Byte 2<br />
1 ••.<br />
.xxx xxxx<br />
DCBIOBAD<br />
DCBLNP<br />
DCBQSLM<br />
1 •••<br />
. 1 ..<br />
•• 10<br />
• • 11<br />
•• 01<br />
DCBODEBA<br />
DATA CONTROL BLOCK -- SAM<br />
Field Description, Contents, Meaning<br />
1419 MAGNETIC CHARACTER READER AND<br />
1215 OPTICAL READER SORTER INTERFACE (Continued)<br />
Device type.<br />
TSO Terminal.<br />
1419 Magnetic Character Reader.<br />
1215 Optical Reader Sorter.<br />
An indicator used by the appendages to pass<br />
information about one channel chain to an appendage<br />
associated with another channel chain. See IBM<br />
<strong>System</strong>/360 Operating <strong>System</strong> IBM 1419 MagnetiC:<br />
Character Reader, IBM 1215 Optical Reader Sorter,<br />
Device Dependent BSAM PLM, GY21-0012, for information<br />
concerning the use of this field.<br />
Reserved.<br />
50 OS <strong>System</strong> <strong>Control</strong> <strong>Blocks</strong> (Release 21.1)<br />
COMMON I NTERF ACE<br />
END OF DEVICE INTERFACE SEGMENTS<br />
Number of buffers required for this data set.<br />
May range from 0 to a maximum of 255.<br />
Address of buffer pool control block.<br />
Length of buffer.<br />
May range from 0 to a maximum of 32,161.<br />
Data set organization to be used.<br />
Code<br />
IS Indexed sequential organization.<br />
PS PhYSical sequential organization •<br />
DA Direct organization •<br />
(Reserved bits)<br />
PO Partitioned organization •<br />
U Unmovable - the data contains<br />
location dependent information.<br />
GS Graphics organization.<br />
(Reserved bits)<br />
Address of the IOD when chained scheduling is used or<br />
for 1419/1215.<br />
3525 printer line position counter.<br />
QSAM locate mode logical record interface - UPDAT<br />
processing of spanned records:<br />
Only one device is allocated to this data set.<br />
Update complete, free old DEB •<br />
Update to take place •<br />
No update to take place •<br />
Old DEB address must be saved •<br />
Note: Logical record interface processing involves<br />
use of a record area in which record segments are<br />
combined. In this processing mode, GET and PUT refer<br />
to records, not record segments.<br />
Address of the old DEB (for spanned records and IBM<br />
3525).
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