Time it takes to perform a read or write operation, that is$,$ the time from the instant that an address is presented to the memory to the instant that data have been stored or made

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available for use.

all the interrupts may be assigned different priorities, so that whenever an interrupt occurs while an interrupt handler is running, their priorities will be compared first, and the

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further action will be determined according to the result

Mechanism to control the access to a bus. Can be centralized ore distributed.

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If an interrupt occurs during this time, it generally remains pending and will be checked later.

DIV by zero, I$/$O$,$ Signal, Program request.

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disabling interrupt request while an interrupt is being processed, all interrupts will be processed sequentially.

Number of bits or lines in the bus that identify the size.

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The aggregate data transfer demand approaches the capacity of the bus