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Int 14h, 00h            Initialize Serial Port Parameters

    Initializes the baud rate, parity, stop-bit, and word length
    parameters for a serial port, and returns the status for the port.

        Entry   AH = 00h
                AL = Communications parameters (see below)
                DX = Serial port number (0 - COM1, 1 - COM2, etc.)

        Return  AX = Line and modem status (see Service 03h)

    ------------------------------------------------------------------

           Baud rate        Parity        Stop bits      Word Length
    Bit    7 6 5            4 3           2              1 0
           0 0 0    110     0 0  None     0  One         1 0  7 bits
           0 0 1    150     0 1  Odd      1  Two         1 1  8 bits
           0 1 0    300     1 0  None
           0 1 1    600     1 1  Even
           1 0 0  1,200
           1 0 1  2,400
           1 1 0  4,800
           1 1 1  9,600