X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int b3 - zipkey - look up zipcodes for a given state and city

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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)
SeeAlso: AH=79h,7Ah

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