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Although mechanical examples
of computers have existed through much
of recorded human history, the first
electronic computers were developed in
the mid-20th century (1940 - 1945).
These were the size of a large room,
consuming as much power as several
hundred modern personal computers
(PCs). Modern computers based on
integrated circuits are millions to
billions of times more capable than the
early machines, and occupy a fraction
of the space.
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