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The first commercially available computer was the Lyons Electronic Office. Used to solve clerical problems, this computer helped solve the problem of daily shcedule production.

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1. IBM's own Personal Computer (IBM 5150) was introduced in August 1981, only a year after corporate executives gave the go-ahead to Bill Lowe, the lab director in the company's Boca Raton, Fla., facilities. He set up a task force that developed the proposal for the first IBM PC.

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In 1981, the company incorporated in the state of Washington and became Microsoft Inc. Bill Gates was the President of the Company and the Chairman of the Board, and Paul Allen was the Executive VP.

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1. Steve Jobs introduced the original Macintosh computer on January 24, 1984. This was the first mass-market personal computer featuring an integral graphical user interface and mouse.

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1. A game called OXO (Noughts and Crosses) was a tic-tac-toe computer game made for the EDSAC computer at Cambridge in 1952. It was the first known (graphical) game to run on a computer even if it didn't move like Tennis For Two.

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One component of a mainframe computer, as they were known, was the CPU, or Central Processing Unit. The CPU was a big pile of equipment. The thought that the CPU could be reduced to a chip of silicon the size of your fingernail was the stuff of science fiction.