I have built some for other systems by following and using files from this forum http://nfggames.com/forum2/index.php?topic=4393.0 , however I am not sure of how exactly to go about making one for the genesis. The original creator never made one and moved on to a new version of his wireless controllers so I am not sure if the ic's I have will be able to do it or not. I have attiny2313's and atmega8's for the microcontrollers and NRF24L01+ modules for the transceivers which is what was used in the other retro controller conversions. Any help would be appreciated thanks.