I would like to know if it would be easy to design a KISS TNC(similar to = serial modem for a PC but operates at 1200 bd half duplex) with a PIC =nd little to no other circuitry to keep the cost and complexity down. TNX + 73--- Andy N1YEW Andy, Take a look on the tapr website www.tapr.org they have one already built John W2SP -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics