INT 14 - COURIERS.COM - CONFIGURE PORT
        AH = 82h
        AL = port number (1-4)
        BX = speed (bps)
        CX = bit flags
            bit 0: enable input flow control
            bit 1: enable output flow control
            bit 2: use X.PC protocol (not yet implemented)
SeeAlso: AH=00h,AH=8Ch,INT 7A"X.PC"

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