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   tp_clearin() - clear input buffer

   tp_clearin(nPort)

   nPort       Serial port number.

   Clears the input buffer, discarding all characters which have not
   been read.

   Example:

       if alert("About to destroy data!;Is this OK?",{"Yes","No"})==1
           tp_clearin(1)       // Clear port 1 input buffer.
       endif