I have this unusual Third Strike GD-R that I got on the forums here a while ago. I'm wondering if there is any combination of buttons or tricks of any kind that might make a debug menu pop up. probably a long shot, but was there a common method that I could try with my GD-R?
Unfortunately there is no common method for activating a debug menu. Best option is to just try some stuff out, and/or look for known capcom codes (if they exist that is). Otherwise dumping the disc and analyizing the contents is a good way to go.