Forgot to mention, I used an USB keyboard, with an adapter.
$70 for an adapter? Thats insane! I got mine for less than $1.

https://www.aliexpress.com/item/MOSUNX-Futural-Digital-Hot-Selling-1PCS-USB-Female-to-PS2-PS-2-Male-Adapter-Converter-keyboard/32804618151.html

Most cheap USB keyboards work with these.

Hi

Just got a PS/2 keyboard working on a TI-83. It was kinda easy, since there are already libraries for PS/2 input and TICL.
I thoug: the old an unused Scroll Lock can be used to switch between normal and tokenized input. NumLock can be used to enable a special input for asm programs.

I think the best solution for the hardware that requires few soldering skills is this:

All I had to do was solder 4 jumper wires. It can be easily connected and disconnected to the Arduino. The same for the stereo jack.

Thank you Unicorn

Hi everyone

I'm Mario.
I found this forum after several hours of searching the way the TI-calc keyboard works (https://codewalr.us/index.php?topic=1545)
It seems really interesting and I would like to collaborate!

Glad to be here