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Mainframe computers are very similar to supercomputers, except that they are more commonly found in large business environments, where there is more dependency on high-volume, repetitive tasks, such as scanning input forms, updating information at the end of the day, generating reports, etc
. A mainframe computer may allow hundreds to thousands of users to be connected (or "logged on") to the computer simultaneously.
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IBM is still the largest manufacturer of mainframe computers, and China is the biggest consumer (not surprising, given the business processing required for over 1 billion people!). The IBM Z10 (shown on the right) is popular in large banking and financial institutions.
In the late 1970s and early 1980s, smaller more affordable mainframes were being made for small businesses and educational environments. These machines were known as "minicomputers". However, the arrival of the PC caused most minicomputer companies to collapse by the 1990s, including Digital Equipment Corporation (DEC), Data General, Prime, and Honeywell. Today, the term "minicomputer" is virtually obsolete.
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The term "PC" was coined by IBM with their 1981 release of the "IBM PC". When similar machines were produced by other manufacturers, they were known as "PC compatibles". Today, PC is a generic term for any computer is small enough for a single person to own and operate.
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Today, personal computers come in a wide variety of sizes, prices and functionality. Although there is no universal agreement on the categorization of PCs, they have b