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Offset<br />
-8 (-8) 2<br />
Bytes and Field<br />
Alignment Name<br />
-6 (-6) 1 CVTMDL<br />
-4 (-4) 4 CVTRELNO<br />
o (0) 4 CVTTCBP<br />
4 (4) 4 CVTOEFOO<br />
8 (8) 4 CVTLINK<br />
12 (C) 4 CVTJOB<br />
16 (10) 4 CVTBUF<br />
20 (14) 4 CVTXAPG<br />
24 (18) 4 CVTOVLOO<br />
28 (lC) 4 CVTPCNVT<br />
32 (20) 4 CVTPRLTV<br />
36 (24) 4 CVTILK1<br />
40 (28) 4 CVTILK2<br />
44 (2C) 4 CVTXTLER<br />
48 (30) 4 CVTSYSAD<br />
52 (34) 4 CVTBTERM<br />
56 (38) 4 CVTDATE<br />
COMMUNICATION VECTOR TABLE<br />
Hex.<br />
Dig. Field Description, Contents, Meaning<br />
Reserved.<br />
26 OS <strong>System</strong> <strong>Control</strong> <strong>Blocks</strong> (Release 21.7)<br />
Model 10. The model number of the CPU in decimal.<br />
Each digit is represented by four bits, and the<br />
significant digits are right justified in the<br />
half-word. For example, a Model 50 would be<br />
represented as 0050.<br />
Release number. The level of this release, in<br />
EBCDIC.<br />
Address of a double word, the first containing the<br />
next-to-be dispatched TCB address, the second<br />
containing the last (current) TCB address. Both<br />
words are identical unless the task goes into a WAIT<br />
state. When in a WAIT state, the first word is set<br />
to zero until the waiting is over; then both words<br />
are once again identical.<br />
Address of routine to schedule asynchronous exits.<br />
Address of the DCB for the SYS1.LINKLIB data set.<br />
Address of work queue control blocks used by the job<br />
scheduler.<br />
Address of the buffer of the resident console<br />
interrupt routine.<br />
Address of the I/O supervisor appendage table.<br />
Address of entry point of the task supervisor's<br />
address validity checking routine.<br />
Address of entry point of the routine which converts<br />
a relative track address (TTR) to an absolute track<br />
address (MBBCCHHR).<br />
Address of entry point of the routine which converts<br />
an absolute track address (MBBCCHHR) to a relative<br />
track address (TTR).<br />
Address of the channel and control unit portion of<br />
the UCB lookup tatle.<br />
Address of the UCB address list portion of the UCB<br />
lookup table.<br />
Address of entry point of an XCTL routine that brings<br />
system error routines into the error transient area.<br />
Address of the system residence volume entry in the<br />
UCB table.<br />
Address of entry point of the ABTERM routine.<br />
Current date in packed decimal.
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