/diy/ - Do It Yourself

>>1611069
folks on the cemetech forum mention using a microcontroller (MSP430) to relay the keypresses. The pi is apparently slow at handling the keyboard matrix on it's own, and would waste a lot of time.

https://symbolibre.org/

is a french project working on this sort of thing, but no clue how their development is going.

a dude on the cemetech forums went through the trouble of making a PCB rather than interfacing with the one already in the calculator, if that's any indication. Obviously, you'd want the keypad to look and feel legit, but it seems like a real motherfucker to pull off.