The history of computers starts out about 2000 years ago, at that time the birth of the abacus; this is a wooden rack holding two horizontal wires with beads strung on them. When these beads are moved around, According to programming rules memorized by the user, all regular arithmetic problems can be done. Another important invention around at the same time was the Astrolabe, it used for navigation.
Blaise Pascal is credited for building the first digital computer in 1642. He added numbers entered with dials and it was made to help his father, a tax collector. During 1671, Gottfried Wilhelm vonLeibniz created a computer that was built in 1694. It could add, and, after make changing some things around, multiply. Leibniz a special stepped gear mechanism for introducing the addend digits, and the great thing is that this is still being used.
The prototypes made by both Pascal and Leibniz were not used in many places, and considered weird until a little more than a century later, when Thomas of Colmar (A.K.A. Charles Xavier Thomas) invented the first successful mechanical calculator that could add, subtract, multiply, and divide. A large number of improved desktop calculators by many inventors followed, so that by about 1890, the variety of improvements included:
• Accumulation of one-sided results
• Storage and automatic re-entry of previous results (A memory function)
• Printing of the results
Each of these required manual installation. All of these improvements were mainly made for commercial users, and not for just the needs of science.
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