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Simulation of electronic components such as objects with computing power, scientific name the computer.

Originally invented by John von Neumann (then equivalent to the current computing power of the computer's calculator), there are three big warehouses, evolved later.

Is a way to follow the instructions on the various data and information for automatic processing and handling of electronic equipment. It is composed by several parts, such as CPU, motherboard, memory, power supply, video card ......

Computer named computer science, electrical calculators from the early evolved. In 1945, the world has witnessed the first electronic digital computer "ENIAC", used to calculate the trajectory. By the Institute of Electrical Engineering, University of Pennsylvania Moore made, but it's bulky, covers an area of ??500 square meters, weighing about 30 tons, consumed 100 kilowatts of electricity. Obviously, such a computer is costly, inconvenient to use. In 1956, the birth of the transistor computer, this is the second-generation computer. Just a few larger cabinet can only put it, computing speed is greatly increased. Appeared in 1959, is the third generation integrated circuit computer.

From the 20th century, 70's, this is the latest stage of computer development. By 1976, the large scale integrated circuits and ultra large scale integrated circuit made of "Cray One," the computer into the fourth generation. The invention of ultra large scale integrated circuits, so that a small computer continuously toward miniaturization, low power, intelligent, systematic direction of replacement.

90 20th century, the computer to the "intelligent" direction, to create a computer similar to the human brain, can be thinking, learning, memory, network communication and so on.

In the 21st century, it is laptop computers, miniaturization and specialization of operations per second rate of more than 100 million times, is not only easy to operate, inexpensive, and can replace the mental part of the people, and even expanded in some areas people intelligence. So, today's micro-computer to be called the image of a computer.
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The world's first personal computer introduced in 1981 by the IBM. Computer History

In 1945, the United States produced the first fully automatic electronic digital computer, "Eni Akbar" (English acronym is ENIAC, the Electronic Numerical Integrator and Calculator, Chinese means Electronic Numerical Integrator and Calculator). It is the United States to meet the Auberdine calculated ballistic weapons testing ground for the development of the needs of the. Inventor of an electrical engineer major Preis Boai Specter (J. Prespen Eckert), and physicist Dr. Yue Hanmo Qile (John W. Mauchly). This computer for delivery in February 1946, a total of 9 years service. It uses the tube as the basic components of a computer, 5,000 times per second to add and subtract. It uses 18,000 tubes, 10,000 capacitors, resistors 7000, volume 3000 cubic feet, an area of ??170 square meters, weight 30 tons, power 140 ~ 150 kW, is a veritable "monster."

The advent of ENIAC machine epoch-making significance, indicating that the computer era, in the next 40 years, very rapid development of computer technology, science and technology in human history has not a subject with the pace of development compared to the electronic computer.

The following describes the structure of each generation of computer hardware and system features:

A first generation (1946 ~ 1958): tube digital computer

Computer logic devices using electron tubes, mercury delay line with main memory, magnetic drum, magnetic core; external memory using magnetic tape; software is mainly used in machine language, assembly language; applications to scientific computing based. Its characteristics are large in size, power consumption, reliability is poor, expensive, complex maintenance, but it laid the basis for future computer technology.

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