FWIW it's very difficult to brick a calculator without doing so intentionally. The boot sector has a recovery mode built in for reflashing in case of the worst and the boot sector itself is write protected except in some very exceptional circumstances.

Ah, good. Thanks Drew. By the way, I didn't see any actually, you know, graphing applications in the repos. Those exist, right?

They don't - KOS currently doesn't have FP support (although the C library[1] does provide FP, it's not too accurate or fast)

[1] https://www.github.com/KnightOS/libc

FP?? I was asking about using the calculator as a calculator.

EDIT: Oh, floating point! Now it makes sense!

There are a lot of used ones on eBay. The devices for all those graduated kids has to go somewhere.

Looks like ~$20 for a TI-73, vs. $70 on Amazon, and ~$40 for a TI-83+, vs. ~$80 on Amazon.

Ah. I always forget to check ebay. Although pre 84+ calculators were a pain to flash...

Way back in the day I built a parallel port to 3.5mm jack flasher for my 83

Yeah, but USB to 3.5 is a bit harder, IIRC...

Surely arduino's these day would make that pretty simple

Yeah, but I don't know how do do it :-(.

I'm not so good at hardware...