INT 17 - Alloy NTNX, MW386 - SET DATA DRIVEN PRINT BREAK

	AH = 97h
	AL = mode
	    00h NTNX compatibility
	    02h MW386 v2+
		BX = logical device number
		    00h-03h = LPT1-LPT4
		    04h-07h = COM1-COM4
	CH,CL,DH = three character break sequence
	DL = subfunction
	    00h set break string
	    else reset break
Return: AL = status (see #00642)
Notes:	mode 00h affects only logical LPT1
	when the break string is encountered, the spool file will be closed and
	  queued for printing automatically
	the break string is not permanently saved, and will be reset each time
	  MW386 or the user is rebooted
SeeAlso: AH=9Bh