INT 78 - TARGA.DEV - SEND SCSI COMMAND
        AH = 10h
        DS:SI -> command bytes
Return: AH = SCSI status byte
        CF clear if successful
            AL = SCSI message byte
        CF set on error
            AL = error code (see AH=00h)
SeeAlso: AH=11h,INT 21/AX=4403h"ST-01"

Format of SCSI Command:
Offset  Size    Description
 00h    BYTE    length of command
 01h    ???     command bytes

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