A general purpose computer can store different program structures and offer fairly extensive instructions to write programs. General purpose computers can perform any kind of jobs either business oriented or scientific oriented with equal efficiency and speed. A special purpose computer is designed to perform special types of jobs and therefore instructions are inbuilt in these computers by the manufacturer company so that the given task is performed efficiently. These computers are often used to provide only specific functions such as controlling a manufacturing process, directing communication equipment etc.
On the basis of storage capacity and processing speed of data a computer can be classified as.
  1. Super computer
  2. Mainframe computer
  3. Mini computer
  4. Micro computer or Personal computer


Super Computer PARAMIt is the most powerful and expensive computer. It has extremely large storage capacity and tremendous processing speed at least ten times faster than other computers. Inside the super computer there are several smaller computers connecting with one another. Each computer inside a super computer can work on different parts of a job simultaneously. They can be handled and maintained only by computer experts. It can calculate about 400 million numbers every second and can provide exact result. Super computers are used in weather forecasting, medical science, petroleum engineering and for creating computer graphics. Some of the super computers are: CRAY, AECK, SXII, Cyber 20, CDC STAR etc.
PARAM is the name of the super computer which is available in India and it is mainly used for weather forecasting.


Mainframe ComputerIt is a medium computer made by connecting several computer units together. A Mainframe computer is generally used in big organization and government sector for large-scale processing. In India railway reservation, airline reservation, are done with the help of mainframe computer. Mainframe computer can support all kind of high level languages. It can support all numbers of terminal up to 100 or more. It is capable of handling all types of problems whether it is scientific or commercial. It has sigh speed memory which enables it to process applications faster than mini and micro computers.


They are like small mainframe computers. They are consisted of a few separated computer units connected together. They can process information at the rate of 4 million bits per second. They are not so powerful as mainframe computers. They are generally applied to perform smaller works in commercial or government organization.


Micro Computer or Personal ComputerA Micro computer is also known as personal computer is the smallest general purpose computer. It contains a small CPU which is also known as Central Processing Unit or micro processor. A micro processor is a complete CPU inside a single chip. Micro computer are being manufactured at large-scale as compared to others. Micro computers are easy to handle so they are continuously used in different sectors like business, engineering, school and for entertainment etc. they are used to the jobs which does not required critical computing. Micro computer can be used by a single user at a time so that it is named as personal computer.

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