On these early models, pressing '0 INV TAN' would cause the calculator to go into an infinite loop until it was powered off with the OFF button. 1976) contained a logic error in their calculation of inverse tangents. Although the pioneered algebraic notation with precedence and in 1974, the TI-30 made those features available at a more affordable price. The TI-30 could perform nearly all the and functions of an HP-21, its primary competition at the time. ĭisplay digits of the original TI-30 The original TI-30, a cost-reduced but functionally equivalent version of TI's unit, utilized an display, was powered by a, and contained nearly all of its functionality in one chip, where previous calculators used many discrete components. Although the in the US was 24.95 at introduction, it is rumored that the original TI-30 got its name from a planned retail price of US$29.95 or $30. The TI-30 sold an estimated 15 million units during its lifespan from 1976–1983. The TI-30 sold for less than the cost of a professional grade. The Casio FX-20, another popular scientific calculator, sold for roughly double the price of the TI-30. This was much less than the retail prices of other scientific calculators of the era for example, 's cheapest scientific calculator at the time was still well over $100.
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