понедельник, 30 мая 2011 г.

Invention of the calculator

Hello, students. I'm interested to know what you have learned about the invention of the calculator.

Irina Andreevna.
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  1. In 1957 IBM, the company in the U.S., released the first commercial relatively "compact" calculator.Later the first all-electronic desktop calculator ANITA was produced.
    There followed a series of electronic calculator models from these and other manufacturers.
    The Olivetti Programma 101 was introduced in late 1965; it was a stored program machine which could read and write magnetic cards and displayed results on its built-in printer. It is regarded as the first personal computer.
    The first handheld calculator was developed by Texas Instruments in 1967. It could add, multiply, subtract, and divide, and its output device was a paper tape.
    The electronic calculators of the mid-1960s were large and heavy desktop machines due to their use of hundreds of transistors on several circuit boards with a large power consumption that required an AC power supply. By 1970, a calculator could be made using just a few chips of low power consumption, allowing portable models powered from rechargeable batteries.

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