Format of ASPITAPE.SYS mtget parameter block:
Offset Size Description )
00h BYTE ASPI host ID
01h BYTE SCSI target ID
02h BYTE SCSI logical unit number
03h BYTE device parameters
bit 0: drive must use fixed-block read and write
bit 7: drive is an ASPI device
04h BYTE current device state (see #01556)
05h BYTE unit number within driver
06h WORD fixed block blocksize
08h BYTE last SCSI status
09h BYTE last SCSI sense key
0Ah WORD last SCSI opcode (packed) (see #01557)
0Ch WORD residual bytes from SCSI opcode