Mainframe
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Mainframes (often nicknamed big iron) are large and "costly" computers used mainly by government institutions and large companies for such things as data processing, industry/consumer statistics, and financial transaction processing.
The term was first used during the early 1970s with the introduction of smaller, easier-to-use systems such as DEC's PDP-8 and PDP-11 series. They were soon called minicomputers (minis for short). The name "mainframe" was later used for larger, earlier types (previously known simply as "computers").
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