History of Computers - by: Venus Nadine J. Abacahin

Jul 7th, 2015
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Clayton State University
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The first computers were the people. They do the typical computing operation until the early computing devices were invented to aid the humans in the operation. These computing devices eventually improved and developed into more complex computing system. Every computer supports some form of input, processing, and output. During the mechanical age (300BC (Babylonians); 1200’s AD (China)), the first known early computing device is the abacus, as shown in Figure 1, where input, output and processing are simply the act of moving the pebbles into new positions, seeing the changed positions, and counting.

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History of ComputersThe first computers were the people. They do the typical computing operation until the early computing devices were invented to aid the humans in the operation. These computing devices eventually improved and developed into more complex computing system. Every computer supports some form of input, processing, and output. During the mechanical age (300BC (Babylonians); 1200s AD (China)), the first known early computing device is the abacus, as shown in Figure 1, where input, output and processing are simply the act of moving the pebbles into new positions, seeing the changed positions, and counting.Figure 1. The abacus.In 1962, the slide rule (Figure 2) was invented by William Oughtred of Cambridge which was used by the NASA engineers. William Shickard, a German professor, then invented the Schickards calculating clock which was the first gear-driven calculating machine or mechanical calculator that can perform the four basic arithmetic operations.Figure 2. Slide rule (top) and Shickard's calculating clock (bottom).Blaise Pascal, famous mathematician, invented a calculator, in 1642, with eight movable dials called the Pascaline (Figure 3) but can perform the addition operation up to eight digits only. Then in 1820, Charles Xavier Thomas de Colmar invented the Arithmometer which could perform the four arithmetic operations. It was the first manufactured mechanical calculating machine and desktop calculator commercially sold and dist

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