Way Past 2+2

Remember when all that calculators did was simple arithmetic? Now these handy devices have really become special-purpose computers, and the new TI-92 from Texas Instruments Inc. (800 842-2737) shows how much can be crammed into a 20-ounce, $200 package. The TI-92, built around a special version of the Motorola Inc. 68000 processor that powered the original Macintosh, features a diminutive, but full, "qwerty" keyboard. The unit, designed for teaching advanced high school algebra and calculus, does symbolic math--producing integrals, derivatives, and other exotic functions. And it can display and manipulate geometric figures on a small liquid-crystal display. The TI-92 will be available in the fall.

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