<p>The computers which we see today are the modern shape of computers which have been evolved for centuries. The evolution of computers is generally divided into three eras.</p>
<h2>Mechanical Era (Dark Age) </h2>
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Men have been trying to invent machines that can solve mathematical problems. In a mechanical era, humans became successful to make simple machines that can help to perform simple arithmetic operations, in other words, computing. These machines were manually operated since electricity was not invented.
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<b>Some of the important machines of this era are: </b>
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<i>Abacus, Napier's bones (1612 AD), Slide Rule (1622 A
D), etc.</i>
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