I still got an expansion port on the side of my own calculator. I could rewire it so there are buttons mapped to it. I could make a button attachment thingy so there is a d-pad on the left and two buttons on the right for example.
I made a gamepad for my calc once, but the microcontroller inside is not running very optimized code. It's polling for a signal and I should have used hardware interrupts for that. To play games using this thing people will have to add gamepad support in their game.
I am not sure. I do not own a TI83+. I'd have to buy one for this project. If I were to make this I should probably do some more research on which buttons are used by games and menu's.
My own TI84+ had a soundchip in it at some point and I know there is not a whole lot of electronics inside of a calculator. I could just cut off the entire keypad pcb and and rewire some buttons. I'm pretty confident it would fit inside a GBA case if I use a lithium ion battery.
Hmm. SD cards could work if I put an spi header on the soundchip interface (it's a microcontroller running the soundchip program and a software communication protocol)
Yeah... about that. My game uses 2nd and mode as fire buttons for left and right fire. Someone else's game uses all num-keys. See n-gage. The button wireing is a point of discussion. There's not a real standard yet.
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