Multiple choice

Which of the following is true for a CPU, having a single interrupt request line and a single interrrupt grant line?

  1. Neither vectored interrupt nor multiple interrupting devices are possible.

  2. Vectored interrupts are not possible but multiple interrupting devices are possible.

  3. Vectored interrupts and multiple interrupting devices both are possible.

  4. Vectored interrupt is possible but multiple interrupting devices are not possible.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

With only one interrupt request line and one grant line, the CPU cannot distinguish between multiple devices to provide a unique vector address (vectored interrupt). However, multiple devices can still be connected to the same line using daisy chaining or polling.

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