wrote the brief introduction on mainframe comp , minicomputer, microcomputer
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Mainframe computer - A mainframe computer, informally called a mainframe or big iron, is a computer used primarily by large organizations for critical applications, bulk data processing (such as the census and industry and consumer statistics, enterprise resource planning, and large-scale transaction processing).
Minicomputer - A minicomputer is a type of computer that possesses most of the features and capabilities of a large computer but is smaller in physical size. Minicomputers are mainly used as small or mid-range servers operating business and scientific applications. ... A minicomputer may also be called a mid-range computer.
Microcomputer - Microcomputer, an electronic device with a microprocessor as its central processing unit (CPU). Microcomputer was formerly a commonly used term for personal computers, particularly any of a class of small digital computers whose CPU is contained on a single integrated semiconductor chip.