INT 17,1 - Initialize Printer Port

	AH = 01
	DX = printer port to initialize (0-2)


	on return:
	AH = status, see INT 17,STATUS


	- initializes printer port and returns status
	- outputs characters 0x08 and 0x0C to printer port which
	  reset Epson and IBM printers, but may produce undesirable
	  effects on other printers