dacPort()

         Determines the parallel port where the DAC is placed

    Syntax:

         dacPort( nPort ) -> nOldPort

         nPort : The number indicating the parallel port. Value 1 indicates
                 LPT1 and 2 indicates LPT2.

    Description:

         Determines the parallel port where the DAC is placed.
         Default port is LPT1.

    Return:

         Determine in what port is actually the DAC.

    Example:

         dacPort( 2 )           // Now everything will go to LPT2