First Generation, Vacuum tube, as large as a room, cost a lot for production and maintenance, UNIVAC, ENIAC, millsecond, Second Generation, Transistor, less power consumption when compared with the first generation computers, smaller size when compared with the first generation, micro second, it costs a lot for purchasing as first generation, IBM 7030, CDC 1604, Third Generation, Integrated circuit, less power consumption when compared with the second generation, smaller size when compared with the second generation, Nano second, cost less for purchasing when compared with the second generation, IBM 360, CDC 6600, Fourth Generation, Microprocessor, Picosecond, costs less for purchasing when compared with the third generation, Tablet, Laptop, smaller size when compared with the third generation, less power consumption when compared with the third generation

Evolution of Central Processing Unit

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