for the fx-ES Plus series of calculators which are the upgraded version of the fx-ES series. Natural Display uses natural representation of mathematical expressions and formulas through a 96×31 dot matrix LCD display. ![]() as they are written in a standard textbook. It allowed the display of expressions of fractions, exponents, logarithms, powers and square roots etc. ![]() The fx-82ES introduced by Casio in 2004 was the first calculator to incorporate the Natural Textbook Display (or Natural Display) system. is similar to the Direct Algebraic Logic (D.A.L.) used by Sharp in some of their scientific calculators. system was also used in the other W series models and also the MS series of calculators that followed. The model featured a 5×6-dot LCD matrix cells on the top line of the screen and a 7-segment LCD on the bottom line of the screen that had been used in Casio fx-4500P programmable calculators. In 1998, the Casio fx-991W model used a two-tier (multi-line) display and the system was termed as S-V.P.A.M. brand was first used in 1994 when the fx-991S and other scientific calculators from the "S" series were released in Japan. Functions, operators and symbols are shown on the calculator display and calculations are performed according to operator precedence. calculations can be input exactly as they are normally written. In the infix notation the precedence of mathematical operators is taken into account. is an infix system for entering mathematical expressions, used by Casio in most of its current scientific calculators. calculators are scientific calculators made by Casio which use Casio's Visually Perfect Algebraic Method ( V.P.A.M.), Natural Display or Natural V.P.A.M. With its multitude of features, pocket-friendly design, and durability, it offers a reliable solution for various mathematical and scientific calculations.Family of scientific calculators by CasioĬasio V.P.A.M. In conclusion, the Casio FX-991EX is a compact and versatile scientific calculator. Its sturdy build quality ensures that it can withstand regular usage without any compromise in functionality. Despite this limitation, the calculator's compact form factor and lightweight design make it highly portable and convenient to use on the go.Ĭonstructed with premium materials, the Casio FX-991EX ensures durability and long-lasting performance. The calculator does not have a tilting display, which means it cannot be adjusted to different angles for improved viewing comfort. ![]() The LCD display type ensures optimal visibility even in well-lit environments, although it does not have a backlight display for enhanced visibility in low-light conditions. Its control is operated through buttons, allowing easy navigation and input of calculations.įeaturing a 16-digit display, the Casio FX-991EX provides a clear and concise view of numbers and calculations. ![]() Powered by both battery and solar energy, the calculator uses a single LR44 battery, providing a reliable power source for prolonged use. With a weight of 90 grams and a width of 77 millimeters, it is compact and portable, making it convenient to carry around. The Casio FX-991EX is a pocket-sized scientific calculator that offers a wide range of functions and features.
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