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1642: French scientist Blaise Pascal invents first machine that can solve addition and subtraction equations.


1832: English mathematician Charles Babbage adds punch cards that give the computer memory.


1939: American mathematician John V. Atanasoff develops the first computer powered by electricity.

1960s: Companies and the government start making more and more use of big computers.


1975: The development of the silicon chip made smaller computers possible. Bill Gates and Paul Allen start Microsoft.


1976: Steve Jobs and Steve Wozniak start Apple Computers.

1977: Apple begins selling its first popular computer, the Apple II.

1981: IBM releases the popular 5150, using Microsoft's operating system.


1984: Apple introduces its popular Macintosh computer.

1991: The World Wide Web begins and computer sales increase.


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