This tells the driver to write data to the device and, if possible, to
verify that the data was written accurately.

The parameters for this request are identical to:

Notes:   This is the device driver "catch-point" for DOS write fns such
as 40H (write to file or device) when DOS is in VERIFY mode
(see fns 2eH and 54H).

See Also: Device Requests
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Device Request 09H: Output (Write/Verify Data to Device)