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INT 14h, 04h (04)      Initialize Extended Serial Port                  PS/2

     Sets up the PS/2 Serial Port parameters.

             On entry:          AH      04h

                                AL      Break:
                                        0 . No Break
                                        1 . Break

                                BH      Parity:
                                        00 . None
                                        01 . Odd
                                        02 . Even
                                        03 . Stick parity odd
                                        04 . Stick parity even

                                BL      Stop Bits:
                                        00 . 1 stop bit
                                        01 . 2 for word length 6, 7, or 8
                                             1. for word length 5

                                CH      Word Length:
                                        00 . 5 bits
                                        01 . 6 bits
                                        02 . 7 bits
                                        03 . 8 bits

                                CL      Baud Rate:
                                        00 . 110 baud
                                        01 . 150 baud
                                        02 . 300 baud
                                        03 . 600 baud
                                        04 . 1200 baud
                                        04 . 2400 baud
                                        04 . 4800 baud
                                        04 . 9600 baud
                                        04 . 19,200 baud

                                DX      Serial Port to Configure

             Returns:           AL = Modem Status (See Service 03h)

                                AH = Line Status (See Service 03h)

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     This service configures the PS/2 serial ports. It is recommended over
     service 00h.

     This is the way you can select the baud rate, word length, parity
     settings, and stop bits that are required in serial communications. You
     only need to code the settings you want as shown above and call this
     service. The PS/2 supports baud rates up to 19,200.

             Notes:      This service returns modem and line status, as
                         does Service 03h. (See Service 03h for details.) See
                         Services 01h and 02h for information on sending and
                         receiving characters.