Int B3 Fn 75  - Zipkey - Look Up State Code For Zipcode                    [U]

   AH = 75h
   DX = zipcode region (0-999)
   CH = last two digits of zipcode (0-99)

Return: CF set on error (zipcode not found)
       AL = suggested state code, FFh if none
   CF clear if successful
       AL = ZIPKEY state code
       BX = area code (v2.0+)

See Also: AH=76h,AH=79h