Preferably a Nintendo-manufactured one, since they make the best D-pads in my opinion. When I was a kid and I heard that there was a version of Karate Champ for the NES, I thought how great it would be if they had retained the dual joystick control scheme from the arcade, and included a special dual D-pad controller for use with it.
And much later on, after discovering MAME, I again wished I had a dual D-pad controller, not only for Karate Champ, but for other dual joystick games like Robotron and Smash TV.
I just happened across a picture of a Virtual Boy controller. It has dual D-pads, and it is made by Nintendo. I don't know how I missed that for all these years.
Any ideas for getting a Virtual Boy controller to work on a PC? Does it use a unique plug, or does it share a plug with any other Nintendo systems?