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The TI-81 is the oldest graphing calculator made by Texas Instruments. It was designed in 1990 for use in algebra and precalculus courses. Since its original release, it has been superceded several times by newer calculators - the TI-82, the TI-83, the TI-83 Plus and TI-83 Plus Silver Edition, and most recently the TI-84 Plus, and TI-84 Plus Silver Edition; most of these share the original feature set and 96x64 pixel display that began with this calculator.
Features of the TI-81
The TI-81 is powered by a ZiLOG Z80 microprocessor, like those used in almost every other Texas Instruments graphing calculator (except the TI-80, TI-89, TI-89 Titanium, TI-92, TI-92 Plus, and Voyage 200). However, the processor only runs at 2 MHz, whereas the other Z80-powered Texas Instruments calculators run at a speed of at least 6 MHz (the TI-83 Plus Silver Edition, TI-84 Plus, and TI-84 Plus Silver Edition run at 15 MHz). It contained 2.4 KB of RAM and no user-accessible ROM.
The TI-81ís user interactions are provided by its so-called Equation Operation System. This is comparable to the interface provided by the more recent TI-82, TI-83, and so on. This system is capable of such tasks as two-dimensional parametric graphing (in addition to standard two-dimensional function graphing), trigonometric calculations in units of either degrees or radians, simple drawing capabilities, creation and manipulation of matrices up to 6x6 in size, and programming in Texas Instrumentsí native TI-BASIC programming language.
If you wish to experiment with a TI-81, Texas Instruments has made available a software program available for either Windows/DOS-based PCs and Macintosh computers which emulates the TI-81 and its Equation Operating System. A link to the site offering this can be found in External Links below.
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