INT B3 - ZIPKEY - LOOK UP ZIPCODES FOR A GIVEN STATE AND CITY AH = 78h BL = ZIPKEY state code DS:SI -> city name, terminated with 0Dh if complete name, 00h if prefix Return: BH = number of matching entries (set to 51 if more than 50) DX = zipcode region of first match (0-999) CL = last two digits of first zipcode in the range (0-99) CH = last two digits of last zipcode in the range (0-99) AX destroyed SeeAlso: AH=79h,AH=7Ah