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