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| Evolution of an Operating |
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| ä | Must
adapt to hardware upgrades and new |
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of hardware. Examples: |
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| ä | Character
vs graphic terminals |
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| ä | Introduction
of paging hardware |
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| ä | Must
offer new services, eg: internet |
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| support |
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| ä | The
need to change the OS on regular basis |
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| place
requirements on it’s design |
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| ä | modular
construction with clean interfaces |
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| ä | object
oriented methodology |
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