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

branches off to the interrupt service routine immediately
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

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Operating System (OS)
The Storage-to-Storage instructions

None of these
which perform an operation on a register operand and an operand which is located in the main store, generally leaving the result in the register, expect in the case of store operation when it is also
which perform indicated operations on two fast registers of the machine and have the result in one of the registers
All of these
have both their operands in the main store.

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Operating System (OS)
System maintenance:

None of these
always requires several programs
is usually not necessary
is necessary on all systems, regardless of how good
is not required if the system is well written

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