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The first generation of computers
Generation of Vacuum Tubes -
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Second-generation computers
The business environment placed much more importance on the cost effectiveness of the system -
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Third-generation computers date from the mid-1960s
The first multiprogramming systems allowed each program to be serviced in turn -
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After the third generation
Computers had faster CPUs, creating an even greater disparity between their rapid processing speed and slower I/O access time. -
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Development in the 1980
Hardware was more flexible, with logical functions built on easily replaceable circuit boards -
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Telecomunications and Multimedia
Web accessibility and e-mail became standard features of almost every oper- ating system. The decade also introduced a proliferation of multimedia applications demanding additional power, flexibility, and device compatibility for most operating systems. -
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Technological Advance on Demand and Virtual Machines
The new century emphasized the need for operating systems to offer improved flexibility, reliability, and speed.
To meet the need for computers that could accommo- date multiple operating systems running at the same time and sharing resources, the concept of virtual machines