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                             Device Status Word

        The device status word is set to zero on entry and is set by
        the driver interrupt routine on return.

        |15|14-10|9|8|7-0| STATUS word
         |    |   | |  +---- Error return code (if bit 15=1)
         |    |   | +------ Done bit, function completed
         |    |   +------- Busy bit
         |    +---------- Reserved
         +------------- Error flag bits 0-7 have error code

      Error return codes

        00  Write protect violation     01  Unknown unit
        02  Device not ready            03  Unknown command
        04  CRC error                   05  Bad drive request structure length
        06  Seek error                  07  Unknown media
        08  Sector not found            09  Printer out of paper
        0A  Write fault                 0B  Read fault
        0C  General failure             0D  Reserved
        0E  Reserved                    0F  Invalid disk change