Not the most retro calculator out there, but the TI-86 is my favorite TI graphing calculator. I've still got all my games and stuff from high school (20+ years ago!) and I
TI-86 Graphing Calculator with Cover Black Texas Instruments | eBay
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Texas Instruments TI-86. Graphing Calculator. for Sale in San Antonio, TX - OfferUp
Texas Instruments Used TI-86 Graphing Calculator For Engineering and Science
Texas Instruments TI-86 Plus Graphing Calculator - Black 9781594249273 | eBay
Linking a TI-86 Calculator with openSUSE – CubicleNate's Techpad