INT 78 - TARGA.DEV - SET SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. DEVICE NUMBER
	AH = 04h
	AL = SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. device number
Return: CF set on error
	AL = error code (see #03786)
Note:	if this routine is not called, the device number used is the driver's
	  default (usually 0)
SeeAlso: AH=02h,AH=05h