INT 78 - TARGA.DEV - SET/CLEAR EARLY RETURN MODE                                
	AH = 06h
	AL = new state
	    00h clear early return mode
	    01h set early return mode
Note:	if early return mode is set then 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. will return with no errors
	  when the last DMAsee Direct Memory Access transfer is started in a call with AH=13h or AH=14h
	if this routine is not called, early return mode is cleared
SeeAlso: AH=13h,AH=14h,AH=15h