Jose, Have a look at: http://webster.cs.ucr.edu/ Randall Hyde has his Assembly Language book available for download. While not written for the PIC's, it does give a good introduction to assembly language. Hope this helps. Kelly Kohls, N5TLE Dallas, Texas - There's never enough time to do it right, but plenty of time to do it over. - We've been asked to do more with less for so long that soon we'll be doing everything with nothing. -- 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