I have a Mathias with the trace module and it works great for the 16C series. Of course, since I got the HiTech C compiler, everything usually works and I have only needed the emulator a couple of times since then. BTW, the compiler integrates well into the Mathias TDE environment. Cheers, Bob -- 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