INT B3 - ZIPKEY - FETCH AN ENTRY FROM A PREVIOUS LOOKUP AH = 7Ah BL = case number (0 to one less than value returned in BH by lookup) Return: AL = ZIPKEY state code DX = zipcode region (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) SeeAlso: AH=78h,AH=79h