How Mainframe Computer Compare with Mini-computers and Micro computers - IBM Mainframe

You can divide most computer systems used for business purposes into three classes— microcomputers, minicomputers, and mainframe computers. Although these divisions are loosely based on the size of the computer systems, there are no hard and fast rules for deciding exactly where one category ends and the next begins. In other words, the categories overlap. As a result, the largest minicomputer systems are often larger than the smallest mainframe computers.

Several factors determine the "size" of a computer system. In particular, the size of a computer's hardware configuration, the nature of its applications, and the complexity of its system software help classify a system as a microcomputer, minicomputer, or mainframe.

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