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THE HISTORY OF COMPUTER
The modern computer is based on the ideas and inventions of many scientists and engineers of the past. Actually, the computer has had three birth dates. One as a mechanical computing device (about 550 B.C.), another as a concept (1883), and the third as a modern electronic digital computer (1946).
The first mechanical calculator, called the abacus, was invented in Babylonia around 500 B.C. The abacus provided the fastest method of calculating and was used until 1642, when the French scientist Blaise Pascal invented a calculator made of wheels and cogs.
It was in 1833 that the concept of the modern computer appeared in Britain. The British mathematician Charles Babbage designed an "analytical engine" that contained all the necessary elements of a modern computer: input devices, memory a computing unit, a control unit, and output devices. The steam-driven "analytical engine" was as large as a locomotive.
hi the late 1920's and 1930's, several new types of calculators were constructed and put into operation. But it was only in 1939 that the real prototype of a computer based on a binary numbering system was produced.