raphnet. - Megadrive/SMS controller to Wiimote adapter (v2)
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Nintendo Support: How to Test the Controller Buttons
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:format(png)/cdn.vox-cdn.com/uploads/chorus_image/image/3361781/screen_shot_2012-11-16_at_7.18.23_am.0.png "The surprising (mundane) tech behind the Wii U's magical GamePad - Polygon")