Hi, I have 2 asm files written by different authors that do the same thing; = decode RC5. If you go thru' the listing, you would get a pretty good = idea on how to go about it. I tried to attach them to this post, but the message bounced back.=20 If you are interested, do let me know. Regards, Anand Dhuru -- 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