INT B3 - ZIPKEY - LOOK UP CITY AND STATE FOR ZIPCODE                            
	AH = 76h
	DX = zipcode region (0-999)
	CH = last two digits of zipcode (0-99)
	ES:DI -> buffer for name
Return: CF set on error
	    AL = suggested state code, FFh if none
	    ES:DI buffer filled with suggested city name
	CF clear if successful
	    AL = ZIPKEY state code
	    BX = area code (v2.0+)
	    ES:DI points one byte beyond end of name
SeeAlso: AH=75h,AH=78h,AH=7Eh