1. Micro or Personal Computers:
A personal computer (PC) is a computer that can perform all of its inputs, processing, outputs and storage activites by itself. A personal computer contains a processor, memory, and one or more input, out put, and storage device.
Examples: PDA Computers , Smart Phone, NoteBook Computers, Laptop
2.Mini or Midrange Computers:
It is larger and more powerful computers than a personal computers. It can excute five million instructions per second. It can execute five million instructions per second. It generally consists of two or more processors. It is more reliable than desktop computer. Mini computers were introduced in 1960s. Mini computers are also called midrange computers.
Mini computers are used in small companies to provide centrallized store of information.
3. Mainframe Computers:
A mainframe is a large computer in term of price, power and speed. It consists of multiple processors. It is specially designed to perform multiple intensive tasks for multiple users simultaneously. It was introduced in 197s. A typical mainframe computer can execute 16 million instructions per second.
It is used in large organizations, such as banks, Universites and Multinational companies etc.
4. Super Computers:
Super computer is the biggest in size, most expensive in price and Powerful than any other computer. It can process trillions of instructions in one second. The modern super computer consists of thousands of microprocessors.
Super computers are used in weather forecasting, weapon design, preparing models of checmical and biological system, mapping the surface of the planets and studying the neural network of the brain.
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