| Interrupt-Driven I/O |
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| ä | Processor
is interrupted when |
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| I/O
module ready to |
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| exchange
data |
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| ä | Processor
is free to do other |
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| work |
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| ä | No
needless waiting |
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| ä | Consumes
a lot of processor |
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| time
because every word |
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| read
or written passes |
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| through
the processor |
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