Not sure which one it is, but either Nts and Volt, or Everyday Paractical
Electronics had an article on using the gamepads with a pic. so that should get
you the infor you need if you can track it down.

If you can't find the info, contact me offline and I will see if I can find
the article


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http://www.piclist.com hint: The PICList is archived three different
ways.  See http://www.piclist.com/#archives for details.