My changes on top of RetroAdapter to make it work with my microcontroller. This is basically the RetroAdapter version 2.1a with some tweaks in the Makefile, an updated usbdrv, and many modules disabled. Built as an USB adapter for SEGA Genesis / Mega Drive controllers.
http://denilson.sa.nom.br/blog/2013-07-15/i-built-a-retroadapter
