What is Computer?
A computer is a programmable electronic device that accepts raw data as input and processes it with a set of instructions (a program) to produce the result as output.
The term "computer" is derived from the Latin word "computare" which means to compute or calculate. Abacus is the first calculating device which is invented in China and Egyptian people.
It is believed that the Analytical Engine was the first computer which was invented by Charles Babbage in 1837. It used punch cards as read-only memory. Charles Babbage is also known as the father of the computer.
Classification of Computer
A) ACCORDING TO SIZE AND STORAGE CAPACITY
1. Micro Computer
2. Mini Computer
3. Mainframe Computer
4. Super Computer
1. Micro Computer
It is a single-user computer which has less speed and storage capacity than the other types. It uses a microprocessor as a CPU. The common examples of microcomputers include laptops, desktop computers, personal digital assistant (PDA), tablets, and smartphones.
2. Mini Computer
Mini-computers are also known as "Midrange Computers." They are multi-user computers designed to support multiple users simultaneously. So, they are generally used by small businesses and firms. Individual departments of a company use these computers for specific purposes.
3. Mainframe computer
It is also a multi-user computer capable of supporting thousands of users simultaneously. They are used by large firms and government organizations to run their business operations as they can store and process large amounts of data. For example, Banks, universities, and insurance companies use mainframe computers to store the data of their customers, students, and policyholders, respectively.
4. Super Computer
Super-computers are the fastest and most expensive computers among all types of computers. They have huge storage capacities and computing speeds and thus can perform millions of instructions per second. The super-computers are task-specific and thus used for specialized applications such as large-scale numerical problems in scientific and engineering disciplines including applications in electronics, petroleum engineering, weather forecasting, medicine, space research and more. For example, NASA uses supercomputers for launching space satellites and monitoring and controlling them for space exploration, it is also used Weather Forecasing purpose.
B) Accourding to the functionality:
1. Analog Computer
An analog computer (spelt analogue in British English) is a form of computer that uses continuous physical phenomena such as electrical, mechanical, or hydraulic quantities to model the problem being solved.
2. Digital Computer
A computer that performs calculations and logical operations with quantities represented as digits, usually in the binary number system (0,1).
3. Hybrid Computer (Analog + Digital)
A combination of computers those are capable of inputting and outputting in both digital and analog.
Page Creater: Chinmoy Tewary, Centre Manager IISM SURI.
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Sir why the mini computer has not any screen
ReplyDeleteParswati this type of computer mainly used for multy user purpose, just like type of server.Thats mean through of this machine which is connected multiple other computer system.
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