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INT 14 - COURIERS.COM - CHECK IF PORT BUSY
        AH = 81h
        AL = port number (1-4)
Return: AH = 00h port available
             01h port exists but already in use
             02h port nonexistent
Note:   COURIERS is a TSR utility by PC Magazine
SeeAlso: AH=8Dh
See Also: 1483
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