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Texas Instruments TI-82
(lemmy.sdf.org)
A community centered around handheld calculators. Show off your collections, ask questions, or trade benchmarks and torture tests.
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That machine is in great shape! I had a Casio fx-7700G in high school and always felt like I had one hand tied behind my back when I had to use a TI-82 for tests. They were capable little machines, but I didn't have the muscle memory to use them quickly.