TOPS-10 Monitor Calls Manual Volume 2 AA-K039D ... - Trailing-Edge

RUN [CALLI 35]
ERROR RETURN
The error return is taken if any errors are detected; the monitor
returns an error code in the ac. Your program can attempt to recover
from an error and continue the-Program's execution. If you set the
left half of the error return location to a HALT, the monitor will not
return to the program but will print an error message. Your terminal
will be at monitor level.
If you do not include a HALT in the left half of the error return
location, your program can analyze the error code returned in the ac.
If the error code indicates an error from which you can recover, your
program can issue another RUN monitor call, possibly including a HALT
instruction in the error return location.
If your program is using overlays, the monitor will not attempt to
return to your program. Therefore, you should place the RUN monitor
call in the low segment of your program, in case the error is
discovered after the high segment has been released. If the call is
issued from the low segment and an error occurs, the high segment of
the program is cleared and must be re-initialized.
If the call is issued from the high segment and an error occurs,
monitor may halt the job and print the following message:
?Illegal address in UUO at user PC xxxxxx
the
For this reason, the RUN call should be given from the low segment.
See Section 11.14 for a list of error codes.
RELATED CALLS
o
o
o
GETSEG
MERGE.
SEGOP.
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