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

UGETF [OPCODE 073]
22.176 UGETF [OPCODE 073]
FUNCTION
Returns the block number of the next free
UGETF call is a no-op for other devices.
for an extended I/O channel.
block on a DECtape; the
Use FILOP. to perform UGETF
CALLING SEQUENCE
addr:
UGETF
return
BLOCK
channo,addr
1
In the calling sequence, the program supplies the following variables:
o
channo is the channel number of an initialized device.
o addr is the address of the location where the monitor will
return a block number at addr.
RETURN
The block number of the
call precedes an ENTER,
is reduced to that used
reduce the number of
reading a large file.
next free block is returned at addr. If this
the inter-block spacing factor used for output
for .SAV files. This function is used to
times the tape must reverse direction when
RELATED CALLS
FILOP.
22-459