Original TI-83 graphing calculator from the '90s - fully functional - my kids used it for high school, then I revived it a few years ago to explore its Z80 processor's ability to compute PI. That project is documented in this article:
https://groups.google.com/g/retro-comp/c/dtkFSmvH1fE
The (huge) manual for the calculator can be found online at:
https://sites.science.oregonstate.edu/math/home/programs/undergrad/TI_Manua...
I'm downsizing and need to dispose of this. It still has all four PI programs in its memory (press PRGM then select any of A, PI, or PIOL. A gives you two compiled program choices. Use QUIT to exit.
Just add 4 AAA batteries and it's good to go. Data cable TI-94327 is included (but not necessary).
Vintage TI Scientific Calculator (Feasterville)
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