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   tp_baud() - get or set baud rate

   nOldBaud := tp_baud(nPort, [nNewBaud])

   nPort       Serial port number.
   nNewBaud    New baud rate.

   Returns     Original baud rate.

   Gets or sets the baud rate used by a serial port.  A port may be set
   to one of these baud rates:

       75      110     150     300     600     1200    2400
       4800    9600    19200   38400   57600   115200

   If nNewBaud is omitted, tp_baud() just returns the current setting.
   If nNewBaud is specified, it changes the setting and returns the
   original value.

   Example:

       tp_baud(1, 9600)    // Set port 1 to 9600 baud.