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| Interrupts improve |
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| CPU usage |
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| ä | I/O
pgm prepares the I/O module |
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| and
issues the I/O command (eg: |
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| to
printer) |
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| ä | I/O
pgm branches to user pgm |
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| ä | User
code gets executed during |
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| I/O
operation (eg: printing): no |
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| waiting |
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| ä | User
pgm gets interrupted (x) |
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| when
I/O operation is done and |
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| branches
to interrupt handler to |
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| examine
status of I/O module |
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| ä | Execution
of user code resumes |
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