Types of Computer
Types of computer can be classified as per internal structure, features and durability of computers and are categorized into two categories:
1. Purpose vise Computers
2. Size vise Computers
Purpose vise computers
These computers are mainly focused on a particular purpose. There are three types of purpose vise computers
1. Analog Computers
Data is transmitted for operations in the form of continuous signals in Analog Computers. These computers work on the basis of continuously changeable aspects of arithmetic data in measurable quantities. Analog computers are used in engineering and scientific purposes and have a wide range of complexity. Side rules, Differential analyzer, the castle clock and Electronic Analog Computers are some examples of Analog computers.
2. Digital Computers
Digital computers can solve the problems by working on data which is in discontinuous or discrete form. It operates on data expressed in binary form i.e. using two digits only 0 & 1. Digital computers consists of Input-Output unit, Memory unit, control unit and arithmetic and logic unit. Many of the input devices can be used to enter data and information into the computer to get the results after processing. Digital Computers are used in hotels, banks, schools etc.
3. Hybrid Computers
Hybrid computers designed to provide various functions and features that can be found in both analog computers and digital computers. In other words, Hybrid computers are the combination of analog computers and digital computers. The purpose of this combination of making hybrid computer is to create a working unit which provide the best quality of both computers. Various analog components of the hybrid computers can provide efficient and structured processing of the differential equations and the digital components can handle the logical operations related with the system.
Size vise Computers
Modern computers are of different sizes and configuration. Computers are classified into four categories according to its size
1. Desktop or Personal Computers
These computers are generally used by a single user and can be kept on a desk or table that is why these are called desktop computer or the personal computers. These can also be defined as small and inexpensive computers specially designed for a single user. Personal Computer (PC) is based on microprocessor technology which enables its manufacturers to put the whole CPU on a single chip. These computers can be used in hospitals, schools and businesses for word processing, accounting, worksheets and data base management. These computers can be used for playing games at home also.
2. Mini Computers
Mini computers have the all the features and capabilities of large computers but is smaller in size physically. Minicomputer is more expensive and powerful than a personal computer but smaller in size and less expensive than a mainframe computers and super computers. Minicomputers are commonly used in scientific and engineering researches, business transaction processing, and for data base management. A laptop is the example of minicomputer.
3. Mainframe Computers
Mainframe computer is a big centralized machine which contains huge storage space, large memory, and multiple high grade processors. As compared to a normal computer system, it has the ultra-processing power. Mainframe computers can be used in large scale organization like banking sectors etc. for scientific research, consumer data and statistics, and census data etc. This computer is capable to run and execute multiple programs at the ultra-speed. Most famous mainframe computers vendors and manufacturers today are Hitachi, IBM, and Unisys. Mainframe computer is very large in size and a very expensive computer with the capacity of supporting hundreds or thousands of users simultaneously. In 1951, UNIVAC I (Universal Automatic Computer I) was the first mainframe computer developed in USA by John Mauchly and J. Presper Eckert.
4. Super Computers
Supercomputer is the most expensive and fastest computer currently available that can process a large amount of data very easily and quickly. The Performance of computing of this computer is very high as compared to any other computer. The computing Performance is measured in FLOPS (floating point operations per second). The supercomputer has thousands of processors and can execute billions & trillions of calculations per second. It allows more than 100 of users to work at the same time. Supercomputers are used in applications which are related to nuclear weapon design, national security and weather forecasting etc.
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