Operating System (OS)
The CPU, after receiving an interrupt from an I/O device

hands over control of address bus and data bus to the interrupting device
None of these
halts for a predetermined time
branches off to the interrupt service routine after completion of the current instruction
branches off to the interrupt service routine immediately

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Operating System (OS)
Swapping

does not work with overlaying
allows many programs to use memory simultaneously
None of these
allows each program in turn to use the memory
works best with many small partitions

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