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

DEVSIZ [CALLI 101]
22.29 DEVSIZ [CALLI 101]
FUNCTION
Returns the buffer size and standard number of buffers for a device.
CALLING SEQUENCE
MOVE I ac,addr
DEVSIZ ac,
error return
skip return
addr:
EXP status
/ SIXBIT/device/ \
I EXP channo I
\ EXP udx /
In the calling sequence, the program supplies the following variables:
o
addr is the address of the argument
address points to the OPEN block
device.
block. Normally, the
used to initialize the
o status is the I/O status word, which must match the
information given when the channel was initialized with INIT,
OPEN, or FILOP.
o
o
o
device is the SIXBIT physical or logical name of a device.
channo is the number of an initialized channel.
udx is the Universal Device Index for a device.
Note that the format for the argument block is identical to the format
used for the OPEN monitor call and that the OPEN block is ordinarily
used as the DEVSIZ block. The number and sizes of buffers differ
among different data modes, and depending on mode modifier bits.
SKIP RETURN
The ac contains the default number of buffers in its left half, and
the default buffer size (including a 3-word header) in its right half.
If you specify a device that was initialized in dump mode, the monitor
clears the ac and takes the skip return.
ERROR RE TURN
One of the following error codes is returned in the ac:
Code Symbol Error
0 DVSDM% Dump mode specified; there.f ore, buffer size is not
applicable.
-1 DVSNX% Nonexistent device.
-2 DVSIM% Illegal data mode.
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