2. Mini Computers
Mini computer is larger and more powerful computer than personal computer. It can execute five million instructions per second. It generally consists of two or more processors. Mini computer is also known as midrange Server. It is normally accessed by users through personal computer or terminal. A device with a monitor, keyboard and memory is called terminal. Mini computer are often used by small and medium-sized companies or departments. Examples of mini computers are IBM System 360 & AS 400.
3. Mainframe Computers
A mainframe computer is a large computer in term of price, power and speed. It is more powerful than mini computer. It consists of multiple processors. It is specially designed to perform multiple intensive tasks for multiple users simultaneously. It can store large amount of data, information and instructions. The users access a mainframe computer through terminal or personal computer. Son and Unisys or leading manufactures of mainframe computers. Mainframe computers are used in large organization such as bank, educational institution and Govt. departments. Examples of mainframe computers are IBM4381 & NEC610 etc.
4. Super computers
Super computer is the biggest in size and the most expensive in price than any other computers. It is used to perform complex tasks. It has a very large storage capacity. It can process trillions of instructions in one second. The modern super computer consists of thousands of micro processors. An example of a super computer is ASCI white. It contains 8192 CPU and can perform 12 Trillion calculations per second. Super computer is mostly used in weather predictions, weapon design and atomic research etc.
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