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Q. Design issues related to interrupt-driven Input - output?
So interrupt handling includes interruption of currently executing program, execution of interrupt servicing program and restart of interrupted program from point of interruption.
Design issues: 2 design issues occur in implementing interrupt-driven I/O:
1) How does processor decide which device issued interrupt?
2) If multiple interrupts have occurred then how does processor determine which one to be processed first?
How does CPU know that an interrupt has taken place? There needs to be a line or a register or status word in CPU which can be increased on occurrence of interrupt situation.
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