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The rise of very expensive commercial computers, only affordable by large organizations and used primarily by professionals. They were massive, while using vacuum tubes as electronic switches and were locked away in rooms which had limited access
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Transistors replaced vacuum tubes in computers. They became smaller and less expensive, which made them more affordable. High level programming languages, such as FORTRAN and COBOL were developed and programming became easier.
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Creation of the integrated circuit and the chip. This further made computers cheaper and smaller, while the processing power of them increased rapidly every two years. Minicomputers and the first software packages were created, signaling the creation of the software industry. These packages were canned programs, ready to be purchased and used.
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Whole computer subsystems were able to fit on a single circuit board. The rise of the desktop computers appearing, like the Altair 8800 in 1975 and IBM's personal computer of PC in 1981, which was developed by Microsoft. Also there were a rise in computer networks.
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Miniaturization of computing machines. Laptop computers were created, while also appearing many improvements in secondary storage media. Also, the rise of use of multimedia, the Internet, and virtual reality. The creation of the smartphone also happened.