| Classes of Interrupts |
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| ä | I/O |
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| ä | signals
normal completion of operation or error |
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| ä | Program
Exception |
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| ä | overflows |
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| ä | try
to execute illegal instruction |
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| ä | reference
outside user’s memory space |
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| ä | Timer |
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| ä | preempts
a pgm to perform another task |
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| ä | Hardware
failure (eg: memory parity
error) |
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