Depending on the device used, system architecture, processing mode and language used in the computers are categorised in the five generation. The development of different types of memories devices has given a sequence of development of computers from mainframe to microcomputers.
We can consider the duration of First-generation starts from 1946. The computers using the vacuum tubes as a memories unit are known as first-generation computers. The second generation computers used transistors as a memories unit. Processing speed ofthis generation is faster than first generation computer. The third generation computers used Integrated circuit chips in place of the transistors. The sized of the computers was generally reduced, the speed of processing was high, they were more accurate and reliable. The computers design using VLSI, as a memory unit is known as Fourth generations computers They have very high speed of processing; they are 100% accurate, reliable,diligent, and versatile. The fifth-generation computers are under development stage. They will have artificial intelligence and will be able to understand natural language.
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