INT 14,4 - Serial Port Extended Initialization (PS/2 & later systems)

	AH = 04
	AL = break setting
	BH = parity setting
	BL = stop bit setting
	CH = word length setting
	CL = baud rate setting
	DX = zero based serial port number (0-3)

			 --- Break Setting ---
			      1 = break
			      0 = no break

	----- Parity Setting -----	  --- Stop Bit Setting ---

	   0 = no parity		   0 = one stop bit
	   1 = odd parity		   1 = 2 stop bits
	   2 = even parity		       1« if register CH=0
	   3 = stick parity odd 	       (5 bit word length)
	   4 = stick parity even

	-- Word Length Setting --	---- Baud rate Setting ----

	       0 = 5 bits		  0 = 110	5 = 2400
	       1 = 6 bits		  1 = 150	6 = 4800
	       2 = 7 bits		  2 = 300	7 = 9600
	       3 = 8 bits		  3 = 600	8 = 19200
					  4 = 1200

	on return:
	AH = port status
	AL = modem status


	- for status bits see INT 14,STATUS