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

UTPCLR [CALLI 13]
22.181 UTPCLR [CALLI 13]
FUNCTION
Clears a DECtape directory. Use FILOP. to perform UTPCLR on an
extended I/O channel. The UTPCLR monitor call is a no-op for other
devices.
CALLING SEQUENCE
UTPCLR
return
channo,
In the calling sequence, the program supplies the channo, which is the
channel number for an initialized device.
SKIP RETURN
The monitor clears the
(except those 7-bit
through 1105 octal) .
directory by clearing the first 83 words
bytes describing blocks 0, 1, 2, 100, and 1102
COMMON PROGRAMMING ERRORS
o
I/O to unassigned channel at user PC xxxxxx.
o Forgetting to place the channel number in
forgetting the comma after channo.
channo
or
o
Not initializing a DECtape on channo.
22-467