You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
Offset<br />
40 (28) 8<br />
48 (30) 1<br />
49 (31) • 1<br />
50 (32) •• 2<br />
40 (28) 2<br />
42 (2A) • 2<br />
44 (2C) 1<br />
45 (2D) • 3<br />
48 (30) 1<br />
49 (31) • 3<br />
52, (34) 1<br />
53 (35) • 1<br />
54 (36) •• 2<br />
Bytes and Field<br />
Alignment Name<br />
DCBDDNAM<br />
DCBOFLGS<br />
xxx. xxx.<br />
••• 1<br />
•.. 1<br />
DCBIFLGS<br />
DCBMACR<br />
Byte 1<br />
x.xx xxxx<br />
.1.. . ...<br />
Byte 2<br />
x.xx xxxx<br />
.1.. . ...<br />
DCBTIOT<br />
DCBMACRF<br />
DCBIFLGS<br />
DCBDEBAD<br />
DCBOFLGS<br />
DCBSCTAB<br />
DCBILCT<br />
DCBUNTCT<br />
DCBUFSI<br />
DATA CONTROL BLOCK -- TCAM<br />
Field Description, Contents, Meaning<br />
FOUNDATION SEGMENT-BEFORE OPEN<br />
Data set name.<br />
Flags used by OPEN.<br />
(Reserved bits)<br />
OPEN has been successfully completed •<br />
DCB is being processed by I/O support routine •<br />
Used by' the I/O supervisor in communicating error<br />
conditions and in determining corrective procedures.<br />
These flags are the same (when applicable) as they<br />
are in the SAM DCB.<br />
Macro instruction reference.<br />
(Reserved bits)<br />
GET<br />
(Reserved bits)<br />
PUT<br />
FOUNDATION SEGMENT-AFTER OPEN<br />
Offset of DD entry from beginning of TIOT.<br />
Contents and meaning are the same as for DCBMACR<br />
before OPEN.<br />
Contents and meaning are the same as for DCBIFIGS<br />
before OPEN.<br />
Address of DEB.<br />
108 OS <strong>System</strong> <strong>Control</strong> <strong>Blocks</strong> (Release 21.7)<br />
The contents and meaning are the same as DCBOFLGS<br />
before OPEN.<br />
LINE GROUP EXTENSION<br />
Address of special characters table (SCT).<br />
Count of invitation lists.<br />
Before OPEN - numerical value of SCT.<br />
After OPEN - count of units for one buffer.<br />
Size of all buffers used for this line group.
Change language