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Basically, the GameBoy buttons are controlled by grounding certain control pins. Touch a grounded wire to a signal pin and its like pressing that key.

Some signal pins:



You can look at more of the pictures above for the locations of the rest of the control pins, like the ones for start, select and so on.

Then basically, you wire those to the contact pairs on the TI83 board so that on each contact, there is a ground and a signal wire. (You should be able to get away with finding a common lead on the board to ground multiple pads. Like I do with the orange wire on the left.)



This whole thing is gonna take quite a while. You have to be fairly patient. It took me a couple hours to do. But I did sharpen my soldering skills, which was good. (By the way, make sure you have a solid solder gun with a nice tip. And good wire. I used some copper telephone wire.)

If you have any more questions or need me to explain it better, I'd be happy to offer some advice.