X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 14 - fossil

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INT 14 - FOSSIL - ENABLE/DISABLE FLOW CONTROL
        AH = 0Fh
        AL = bit mask describing flow control requested
            0: xon/xoff on transmit (watch for xoff while sending)
            1: CTS/RTS (CTS on transmit/RTS on receive)
            2: reserved
            3: xon/xoff on receive (send xoff when buffer near full)
            4-7: all 1
        DX = port number

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