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        Format track and set bad sector flags (XT,port)
        (harddisk only)

        Entry:
          AH = 06h
          AL = interleave value (XT only)
          ES:BX = 512-byte format buffer
                  the first 2*(sectors/track) bytes contain F,N for
                  each sector
                     F = 00 for good sector, 80h for bad sector
                     N = sector number
          CH = cylinder number (bits 8,9 in high bits of CL)
          CL = sector number
          DH = head
          DL = drive
        Return:
          AH = status code (see AH=1 above)

        Notes:  AWARD AT BIOS extended to handle more than 1024 cylinders by
                placing bits 10 and 11 of the cylinder number into bits
                6 and 7 of DH apparently, the AMI BIOS also follows this
                convention