I was actually trying to run the gpasm assembler on a windows machine... just out of interest. We managed to get in installed on another machine in the end, and it works ok. (I think I was trying to use an old version of gpasm on my machine) Thanks for the help. Simon -- 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