There are five generations of computers. They are as follows :
1. First Generation Computers:
They were developed during 1946 to 1958. They used Vaccum Tubes as the electronic devices for their hardware implementation. So these computers were very large.For ex: ENIAC used 19000, vacuum tubes , 7000 registers etc.
2. Second Generation Computers:
The invention of semiconductor transistors by the three physicists John Bardeen, Walter Brattain and William Shookley at Bell Laboratory had made a big revolution in the field of electronics. The transistors replaced the vacuum tubes of the first generation computers.
3.Third Generation Computers:
The technological advancement responsible for the emergence of the third generation computers were Integrated Circuit(IC). An IC is an electronic circuit with a large number of components built on a small silicon chip.
4.Fourth Generation Computers:
The developed of VLSI(Very Large Scale Integration) circuits. VHSIC(Very High Speed Integrated) circuits and microprocessor enhanced the performance of fourth generation computers.The first microprocessor was developed by American Intel Corporation in 1971.
5.Fifth Generation Computers(1991-Present)
After 1990, a new generation of computers called the fifth generation has been under development stage. Leading countries for these computers are EC, Japan and USA, they have been undertaking different projects to design fifth generation computers.
1. First Generation Computers:
They were developed during 1946 to 1958. They used Vaccum Tubes as the electronic devices for their hardware implementation. So these computers were very large.For ex: ENIAC used 19000, vacuum tubes , 7000 registers etc.
2. Second Generation Computers:
The invention of semiconductor transistors by the three physicists John Bardeen, Walter Brattain and William Shookley at Bell Laboratory had made a big revolution in the field of electronics. The transistors replaced the vacuum tubes of the first generation computers.
3.Third Generation Computers:
The technological advancement responsible for the emergence of the third generation computers were Integrated Circuit(IC). An IC is an electronic circuit with a large number of components built on a small silicon chip.
4.Fourth Generation Computers:
The developed of VLSI(Very Large Scale Integration) circuits. VHSIC(Very High Speed Integrated) circuits and microprocessor enhanced the performance of fourth generation computers.The first microprocessor was developed by American Intel Corporation in 1971.
5.Fifth Generation Computers(1991-Present)
After 1990, a new generation of computers called the fifth generation has been under development stage. Leading countries for these computers are EC, Japan and USA, they have been undertaking different projects to design fifth generation computers.
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