So I needed a NES controller but didn't have a working one, but did have a working SNES controller. So I combined them, works great! 

Here is a pic of the finished controller and how it was wired. I soldered the NES wires to the board but you could just splice them if your not good at soldering.

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<a href="http://dfbgaming.com/MattMan/Pics/SNEStoNES.jpg">
<img src="http://dfbgaming.com/MattMan/Pics/SNEStoNES.jpg" height="600" width="800"></a>