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I/O Handling
161
UTILITY:
Mm write start
General Procedure: The record number is determined, then the transfer of the data is made
from the ICOM region to the device buffer. If the buffer allocation causes a memory overflow,
there is an error.
Special Requirements: The record number and msus must be loaded into the MSD in ad-
vance of the call. There must be a stable location (not changed by other activities) for the
MSTID to be held. The data to be transferred must be ready (256 bytes - 128 consecutive
words).
Calling Procedure:
1. Store the data to be transferred in its location. Store the msus and record number into
the MSD area.
2. Load register A with the address of the MSD area.
3. Load register B with the address of the data location.
4. Call the utility.
Exit Conditions:
RET 1
Occurs if there is a memory overflow during execution of the utility.
RET 2
Occurs if all went normally. Register A contains the MSTID. This should be im-
mediately stored in the location reserved for it.
UTILITY:
Mm write test
General Procedure: The MSTID is used to check to see if the data from the buffer has been
transferred to the mass storage device.
Special Requirements:
The MSTID must be available from a previous call to
Mm write start.
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