INT 17 - PRINTER - INITIALIZE PORT

	AH = 01h
	DX = printer number (00h-02h)
Return: AH = printer status (see #00631)
Note:	some printers report that they are ready immediately after
	  initialization when they actually are not; a more reliable result may
	  be obtained by calling AH=02h after a brief delay
SeeAlso: AH=02h,AH=FFh"PC-MOS",INT 1A/AH=10h"NEC",INT 4B/AH=01h