Intel Corporation developed Intel 4004 chips in 1971 for the first time as microprocessors. The result of the development of IC is the development of microcomputers. Many American computers started to manufacture microcomputers since 1973. IT System, AST, ALR, Macintosh, IBM PC Agtec, Wang Laser, Letron, Scan and Imex microcomputers (IBM and IBM compatibles) came into market. Microcomputers are highly efficient in data processing, very much reliable, small and elegant. It can accommodate a huge number of data in a small place. Micro computers are as small as a notebook and are capable of communicating with Mini Computers or Mainframe Computers with the help of Modem (Modulator and Demodulator). In urban areas of Kathmandu and Lalitpur only, many computers are used per household. They are used in teaching, offices, campuses, government and non-government organizations. All the computers used at home and in offices are fourth generation microcomputers. The main processors used in these computers are microprocessors.
Fourth Generation Computers have microprocessors which have serial numbers. The serial number indicates the capability of the computer and speed as well.
In Large Scale Integration (LSI) about 20 thousand transistors and resistors are placed in compact form. Later the compact form of LSI was developed, in which 10/20 LSI could be placed, which was called VLSI (Very Large Scale Integration). The VLSIs are called microchips or microprocessors. The development of VLSI leads to the development of Home computers or Personal Computers (PC), which are famous worldwide and are mostly used.
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