Here’s how to turn a Nintendo controller (USB Retropad) in to a wireless version using a targus wireless keypad. The NES controller uses 8 inputs and one ground for it’s switch state input. The keypad uses a 4×5 matrix decoder. So I split the ground trace on the control pad into 2 parts (you can see this cut in the second image below) and gave each ground to a column on the keypad. Then I jumpered pairs of buttons on the control pad and connected each pair to one of four rows on the keypad, effectively giving me / 8 2 0 for A B Sel Start and * 9 3 . for Up Rt Lf Dn. Link.
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Wow, all I have to say is that mod is upupdowndownleftrightleftrightABselectSWEET! I’m ripping apart my NESAdvantage just as soon as I can dig it out of the closet. Thanks!
This mod started as an original NES controller, not the RetroPad.
Well, unfortunately that website is down right now, and that sweet ass mod gone with it
Here is the updated link for this: http://www.cravediy.com/26-Wireless-NES-Controller-for-PC.html