Int 13 Fn 5506  - Seagate St01/st02 - Scsi Bus Parity                      [d]

   AX = 5506h
   DL = drive ID (80h, 81h, ...)
   DH = subfunction
       00h disable parity check
       01h enable parity check
       02h return current parity setting

Return: AL = status
       00h parity checking disabled
       01h parity checking enabled