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
branches off to the interrupt service routine immediately
halts for a predetermined time
branches off to the interrupt service routine after completion of the current instruction

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Operating System (OS)
Addressing structure

are variations in the use of fundamental addressing structures, or some associated actions which are related to addressing.
defines the fundamental method of determining effective operand addresses
None of these
All of these
performs indicated operations on two fast registers of the machine and leave the result in one of the registers.

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