How did it not work? According to that link, it looks like it will work on anything with four buttons, and the Genesis controller board has four buttons.
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You probably screwed something up. In any case it's pretty much pointless. People seem to think that replacing a d-pad with a joystick will magically give analog control. It doesn't. In fact, it's even worse than a d-pad.
themadhacker wrote:so what. The point is, he wanted do do it, so let him.
And the part that was best about it was...
never mind it dosn't work go ahead try for yourself. I was sad when saw sonic walking to the right without touching the joystick.