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Bytes and Field<br />
Offset Alignment Name<br />
-32 (-20) 32 TCBFRS<br />
o (0) 4<br />
4 (4) 4<br />
8 (8) 4<br />
12 (C) 4<br />
16 (10) 4<br />
16 (10) 1<br />
17 (11) • 3<br />
20 (14) 4<br />
20 (14) 1<br />
.L<br />
21 (15) • 3<br />
24 (18) 1<br />
25 (19) • 3<br />
TCBRBP<br />
TCBPIE<br />
TCBDEB<br />
'rCBTIO<br />
TCBCMP<br />
Byte 1<br />
1 •••<br />
. 1 ••<br />
· .1. . ••.<br />
• •• x 1 •••<br />
• 1 ••<br />
• • 1.<br />
• • . 1<br />
Bytes 2-4<br />
TCBTRN<br />
TCBFLTRN<br />
xx.x<br />
1 •••<br />
• 1 ••<br />
• .1.<br />
••• 1<br />
TCBMSS<br />
.. 1.<br />
TASK CONTROL BLOCK - - MFT<br />
Hex.<br />
Dig. Field Description, Contents, Meaning<br />
Floating point register save area.<br />
Address of the RB for executing program.<br />
Address of the program interrupt element (PIE).<br />
Address of the queue DEBs.<br />
Address of the task I/O table (TIOT).<br />
Task completion code.<br />
A flag byte field containing indicators used or set<br />
by the ABEND SVC.<br />
A dump has been requested.<br />
With subtasking: A step ABEND has been requested •<br />
Without subtasking: Reserved but set to indicate<br />
step ABEND for MVT compatability.<br />
Some problem program storage was overlaid by the<br />
second load of ABEND. A first load overlay is<br />
indicated in TCBFLGS field.<br />
Reserved.<br />
A double ABEND has occurred.<br />
A dump message (WTO) is to be issued to the operator •<br />
Scheduler is to print an indicative dump •<br />
An ABEND message is provided to be printed by ABDUMP •<br />
<strong>System</strong> completion code in first 12 bits; user<br />
completion code in last 12 bits.<br />
These codes are explained in the manual, IBM<br />
<strong>System</strong>/360 Operating <strong>System</strong>: Messages and Codes,<br />
GC28-6631, under the heading ·<strong>System</strong> Completion<br />
Codes. II<br />
Flag byte.<br />
Reserved.<br />
Both TESTRAN and decimal simulator programs being<br />
used on a Model 91 machine.<br />
Suppress taking checkpoints for this step •<br />
Job step TCB. This is a graphics foreground job or<br />
the graphic job processor.<br />
This is a 7094 emulator task .on a Model 85 •<br />
TCBOLTEP-OLTEP functions require cleanup before<br />
abnormal termination can be invoked.<br />
TESTRAN: Address of control core table.<br />
Reserved.<br />
Address of the boundary box.<br />
With subtasking:<br />
316 OS <strong>System</strong> <strong>Control</strong> <strong>Blocks</strong> (Release 21.7)<br />
Job Step TCB: Address of the boundary box.<br />
Subtask TCB: Address of the gotten subtask area<br />
queue element (GQE). A GQE is<br />
present only if the system has<br />
issued a GETMAIN macro instruction<br />
for the space.
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