Modding a NES controller to work on a jamma hookup....??

Hello, I am making a consolized jamma game for my girlfriend and want to use the 2 button NES controllers.

I was wondering what I would have to do to make this possible...

I am looking right at the board inside the controller and I can follow the trails from the buttons directly to the 4021 chip....

can I simply solder wires from the other side of the chip from the pins that line up with the directions and buttons and then to a neo plug and into the AES system for a testing?

Anyone know a site that has all the pins on the 4021 chip for the NES controller, as it would make it a lot easier....

Something like the diagram below but for the NES controller? and not the snes

<img src="http://www.gamesx.com/grafx/snesnesicschem.gif" alt=" - " />

this would help me find the +5v pin and the ground pin

thanks to anyone who can help!!

<small>[ August 09, 2003, 10:16 PM: Message edited by: NGT ]</small>

I've modded SNES controllers to work with a jamma setup before.

Just cut off the microchips and use sandpaper to expose a little bare metal which you can solder onto for each circuit. Jamma button wiring doesn't rely on these type of chips the way a console does. It's just a simple circuit that is either connected or unconnected between ground and the respective pin on the jamma harness. Ground will be the common line on the circuit board that reaches every button.

You might not need diagrams really since it's easy to visually see the contacts that touch each button. Also, the +5V shouldn't be needed at all I don't think.

Can I just solder the wires to the pins on the chip? I don't really want to cut the whole thing off.

Is it possible to do it with the top side of the chip?

If so, that seems to be the easiest way....if I can do it that way.

Here's a link that shows something almost identical to what I did with the SNES pad. Check the hacking a Saturn pad part on this page.

<a href="http://www.alamone.com/jamma.html#saturn" target="_blank">http://www.alamone.com/jamma.html#saturn</a>

You could try soldering right off of the chip, but no guarantees, I've never tried it. It's no big deal to remove the chip (carefully), because you're pretty much sacrificing the controllers for your jamma setup anyway.

You could use a nail clipper to cut the pins. It's really easy. Then you could solder to the left over pin.

So let me get this straight..and sorry, but I just want to make sure I am doing this right...

I take a nail clipper and cut the pins on the cip, right on the side where they connect with the chip. Then, I clip all of them on the chip and throw the chip away. Then, I solder to the pins still sticking out of the board, as well as cutting off the other NES cord completely, leaving only the neo style cord with no 5v hooked up at all.

Does this sound right?

Also, anyone know where I can order the black plastic 15 pin male and female plugs? I would like to stay away from bright silver controller ports on this one if possible.

NGT, I have a bunch of blue plastic 15-pin female connectors... you could just paint them black. They are just the connectors, no wiring (you'd need to solder wires to the opposite end of the connector)... if you want them you can have them. It'd probably be just a buck or two to ship.