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By Tre
I am just posting this in case any is interested. I converted regular Nintendo controllers into USB controllers for use with an emulator. I am working on also converting the zapper as we speak. Both designs use the relatively new USB PIC's.

Full code, schematics, and board layouts posted at:
By doragasu
I'm really interested in this as I was planning to create my own USB arcade stick, and I don't have any clue on how to do driver programming. I'll have a detailed look to the link.

Thanks a lot for sharing your projects with us!!!