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

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INT B3 - ZIPKEY - GET VERSION
        AH = 70h
Return: AH = major version
        AL = minor version
        CL = number of states and territories in current database
        DH = year of current database - 1900
        DL = month of current database's file date
Notes:  if installed, the string "ZIPKEY" is present at offset 75h in the
          interrupt handler's segment, and the byte at 7Bh contains the API
          version number (currently 00h)
        ZIPKEY is a resident ZIPCODE database by Eric Isaacson

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