INT 16 - pcANYWHERE III - COMMUNICATIONS I/O THROUGH PORTIBM PC Portable (uses same BIOS as XT)
	AH = 7Eh
	AL = subfunction
	    01h port input status
		Return AX = 0 if no characer ready,
		       AX = 1 if character ready
	    02h port input character
		Return AL = received character
	    03h port output character in CX
	    11h hang up phone
SeeAlso: AH=7Ch