SegaXtreme

I understand that certain games on the Japanese Mega Drive had region lockout embeded in the software and that a simple coverter or cheat device can't bypass it alone. i also understand that the codes for cheat devices such as game genie, to bypass the software lockout have been discovered for a few games. anyone have a link(s) as to where i can find the ones that are availible?

*edit* perhaps the would be better suited in the regular Genesis subforum? but either way if anyone can help it would be appriciated.