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03-Feb-2016 02:19 by 3 Comments

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The first digital electronic calculating machines were developed during World War II.

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The processing element carries out arithmetic and logical operations, and a sequencing and control unit can change the order of operations in response to stored information.

Peripheral devices include input devices (keyboards, mice, joystick, etc.), output devices (monitor screens, printers, etc.), and input/output devices that perform both functions (e.g., the 2000s-era touchscreen).

Peripheral devices allow information to be retrieved from an external source and they enable the result of operations to be saved and retrieved.

According to the Oxford English Dictionary, the first known use of the word "computer" was in 1613 in a book called The Yong Mans Gleanings by English writer Richard Braithwait: "I haue [sic] read the truest computer of Times, and the best Arithmetician that euer [sic] breathed, and he reduceth thy dayes into a short number." This usage of the term referred to a person who carried out calculations or computations.

A computer is a device that can be instructed to carry out an arbitrary set of arithmetic or logical operations automatically.

Their ability of computers to follow a sequence of operations, called a program, make computers very flexible and useful.

Such computers are used as control systems for a very wide variety of industrial and consumer devices.This includes simple special purpose devices like microwave ovens and remote controls, factory devices such as industrial robots and computer assisted design, but also in general purpose devices like personal computers and mobile devices such as smartphones.The Internet is run on computers and it connects millions of other computers.Since ancient times, simple manual devices like the abacus aided people in doing calculations.Early in the Industrial Revolution, some mechanical devices were built to automate long tedious tasks, such as guiding patterns for looms.More sophisticated electrical machines did specialized analog calculations in the early 20th century.