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| n | The key
contribution is virtual
memory |
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| n | It allows
programs to address memory |
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| from a
logical point of view without regard |
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| to the amount
that is physically available |
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| n | While a
program is running only a portion |
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| of the program
and data is kept in (real) |
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| memory |
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| n | Other
portions are kept in blocks on disk |
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| u | the user has
access to a memory space that is |
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| larger than real
memory |
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