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The HP Prime calc has these features, has been out for years, is FAR, FAR more powerful than any TI calc I know of, including the newer CAS models, has top-facing LEDs so the teacher can know that you're in test mode at a glance, costs (and is worth) $125 or so, and has never taken off at all.


> and has never taken off at all.

Nor have any of TI's attempts at replacing the TI-83 series, like the TI-Nspire. (Which even had a TI-83 emulation mode!)


It even had Dropbox integration and Lua scripting!




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