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

Blk► Chr► 
 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:

          Device Request 08H: Output (Write Data to Device)

   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
          Installable Device Drivers