Hi all Can any one help? What I need is a project/program that take two = NMEA-0183 inputs & one output ( very similar to rs-232 ) the operate on = the input as below 1.It must look for a particular string & change it & output 2.if a string is received on one stream then output it but ignore that = string on the other stream for a period of time 3. if none of the above then just output it What chip would be best to use have any of the chips got two rs-232 = input & one or more out? mike ps sorry if this the wrong place to ask or has been ask before I am new = to this list -- 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