"But Mr. Richard, why ever would you want to do that?" you might ask. Well, there are a few reasons. First of all, the SNES pad feels much more comfortable in your hands than that boxy ole' piece of shite NES controller (god bless it). Secondly, you'll be able to tell all your friends how much cooler you are than them. Need I say more? Didn't think so. Let's continue shall we?

You'll need the following stuff to continue:
1.) An original NES controller
2.) A Super NES controller
3.) A small phillips screwdriver
4.) A soldering iron
5.) A DEsoldering iron (or pump/bulb/wick)

Our goal is obvious. We need to get

THIS


to work with...

THIS!


"Oh, well I can just plug it in... right?"

WRONG!


That's right, genius! The plugs are very different.
However, lucky for us the electronics inside of the two controllers are almost identical. This makes our job relatively simple.

First thing you'll need to do is grab your little screwdriver (you heard me) and take the two controllers apart. There should be five screws holding the SNES controller together, and six on the NES controller. Remove them and be sure to keep them in a safe place, as they're very small and easy to misplace. Carefully pull the two halves apart, trying not to lose anything, and watch for brown recluse spiders. (Seriously bro, they'll fix your little red wagon something feirce). Now that you've taken the two controllers apart and killed any insects that called them home, you should have a mess that looks something like this... (If not, then re-arrange accordingly).



Now let's take a closer look at these two boards. What's the first thing you notice?





If you said "Gee, they both have five wires, all the same color" then give yourself a pat on the back. You've made me proud this day. (But don't you start getting cocky. We haven't finished yet.)
Let's focus on the NES controller board for now. Flip it over and look for the solder points for those five wires. Heat up that soldering iron and take those bad boys out! I recommend a small 15-watt soldering iron for doing work on small electronics like this. If you don't have one, you can pick one up at RadioShack for a few bucks. If you don't know how to solder/desolder, find someone who can or grow some balls and learn how to do it yourself. It's not really that hard. (Don't come cryin' to me if you burn your little piggies, cause chances are I'll probably just laugh. You've been warned.) Moving on...



Now you should have a cord with five little wires sticking out. FANTASTIC! You'll need this.
Now let's take a closer look at that SNES controller board. Aha! See those five wires? Flip the board over and look for this...



See where it says 'CN1'? Good. That's where you need to be looking. Pin #1 is the one all the way to the right and pin #5 is the one on the far left. Anyway, desolder those too and pull the cable/stupid plastic connector thing off the board. We're almost done! Somewhat. ...Okay, not really.
Now you'll need to solder the wires from the NES controller cable onto the SNES controller board. Myself, I had a little trouble getting the little metal prongs on the wires to fit through the holes on the board. If you can't get it in the hole either, the just get some needle nose pliars and squeeze them a little so they'll be easier to fit through the holes. [insert joke here] While you're finished soldering the wires on the board, make sure that none of the wires are touching eachother or it won't work! Anyway, solder them like this...

BROWN to Pin #1
YELLOW to Pin #2
ORANGE to Pin #3
RED to Pin #4
WHITE to Pin #5

Or here's a pretty graphic if you prefer...



EXUBERANCE! You're pretty much done now! Myself, I highly recommend putting some hot glue or epoxy around those little metal prongs there to keep them from moving around and touching eachother. Now put it back together and you're done!
If it doesn't work, well then, you weren't listening. (Probably either didn't solder the wires to the correct spots or two or more wires are touching eachother.)

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Some useful links on this subject

http://www.gamesx.com/controldata/nessnes.htm
http://www.sealiecomputing.com/retrozone/images/DBnes.gif