X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int b3 - zipkey

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INT B3 - ZIPKEY - LOOK UP STATE CODE FOR ZIPCODE
        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
SeeAlso: AH=76h,79h

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