Someone gave this to me 15 or so years ago.
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The TI-86? It’s actually a beast of a calculator when it comes to Linear Algebra. It handles complex matricies better than any other TI calculator with the exception of the Nspire CX and CX II. That said, I have never used one either, lending credence to your observation. I have passed up several auctions for them since the TI-8X line of calculators is not one that I actively collect.
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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.