Hi wasn't the Core Grafx 1 pad the same as the one that came with the Supergrafx? Anyone correct me if I'm wrong. I searched and they looked very similar. There maybe technical differences but stuff like codes, numbers on the outer case etc. It looked more similar than the pad that came with the original Duo which is more of a purple colour I think where the blue is.
I have a Core Grafx 1 pad and a multi tap for sale if you're interested.