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America's best-selling graphing calculator has hardly changed in ten years

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Kevin Wong / Flickr

The TI-84 Plus graphing calculator has a 15 MHz processor, 24 kilobytes of RAM, and a 96x64 black and white screen. It has an Amazon list price of $190.

The Kindle Fire HD has a 1.5 GHz processor, 8GB of memory, and a 1280x800 color screen. Amazon list price: $140.

And yet the TI-84 keeps on selling, its hardware largely unchanged from its first introduction in 2004 — The Washington Post says it's the US' best selling graphing calculator, shifting more than a million units last year and capturing 93 percent of the US market.