The first generation of computers (1945- 1955): vacuum tubes and boards In the mid-1940s, some people from Harvard University, Princeton Institute for Advanced Studies and University of Pennsylvania built the world's first electronic computer with tens of thousands of vacuum tubes, which opened the history of computer development.
The second generation computer (1955- 1965): The transistor and batch processing system computers have become more and more reliable in this period, and have gone out of the research institute and entered commercial applications. In this period, computers mainly completed various scientific calculations, and each calculation task needed special operators to maintain and program. ?
The third generation computer (1965- 1980): integrated circuit chips and multiprograms In the early 1960s, computer manufacturers were divided into two computer series according to different applications, one for scientific calculation and the other for commercial applications. With the deepening of computer application, the need for computers to unify the two applications arises at the historic moment.
The fourth generation computer (1980- up to now): Personal computer With the continuous update and development of computer technology, computers have magically entered people's lives. Computers with powerful computing power are now available at low prices. When the price is no longer the threshold to block the popularization of computers, it is very important to reduce the ease of use of computers.
Because of the characteristics of UNIX system, it is not suitable for running on personal computers, so it needs a new operating system. At this critical moment in history, because IBM underestimated the PC market, it did not use its greatest strength to compete for this market. At this time, Intel took the opportunity to enter and become the boss of today's microprocessors.
Computer parts
1, CPU: It is the central processing unit of the computer, which is the core of the whole computer.
2. Memory: Memory is RAM, which is a kind of memory. Memory can read hard disk data for Cpu. So memory is the bridge between hard disk and cpu.
3. Motherboard: The motherboard of the computer is a particularly critical part of the computer. It can connect all kinds of hardware and make them communicate with each other.
4. Hard disk: Simply put, hard disk is one of the main storage media of computer, which is used to store operating system and user data.
5. Graphics card: Graphics card is also called display card. A good graphics card can improve the fluency of computer operation. Its function is to output the information needed by the computer to the display.
6. Sound card: Sound card, also called sound card, is a device to realize sound wave output.
7. Network card: The network card is an important device for computers to access the network and communicate with other devices.
8, mouse, keyboard, monitor, host and other external devices, some devices are directly connected to the user.