# Evolution of Computers

The Abacus was the first known machine developed to help perform mathematical equations. From what researchers have discovered it was invented around 500 to 600 BC in an area around China or Egypt. This early tool was used to perform addition and subtraction and can still be found used in some of today's Middle Eastern cultures. In 650 AD the Hindus invented a written symbol for zero. Before this no true written calculations could be made, making this one of the most essential inventions to help computers. In 830 AD the first mathematics textbook was invented by a man named Mohammed Ibn Musa Abu Djefar. The subject of this textbook he wrote was "Al Gebr We'l Mukabala" which in today's society is known as "Algebra" (History of Computers).

So what does all of this have to do with computers? Well without numbers computers wouldn't exist or have any reason to exist. The whole point of a computer is to perform mathematical computations. Computers weren't the first to do these mathematical calculations though. In 1623 AD Wilhelm Schickard invented "The Calculating Clock" which would perform operations like addition, subtraction, multiplication, and division. In the year 1801 Jacquard Loom devised a punch card system with a power loom and an automatic card reader. Later that century in 1890 Herman Hollerith invented a census calculator that put each person's information on a punch card and sent it through an electrical/mechanical tabulating machine. This sped up the process from about 7 years to 2 years making this a very efficient method of performing a census, which in turn...

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