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GATE 2024 CS (CS1) – Question 15

Computer Organization and Architecture · I/O Interface: Interrupt and DMA · 1 mark · Multiple choice

Which one of the following statements is FALSE?

  1. In the cycle stealing mode of DMA, one word of data is transferred between an I/O device and main memory in a stolen cycle
  2. For bulk data transfer, the burst mode of DMA has a higher throughput than the cycle stealing mode
  3. Programmed I/O mechanism has a better CPU utilization than the interrupt driven I/O mechanism
  4. The CPU can start executing an interrupt service routine faster with vectored interrupts than with non-vectored interrupts

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Correct answer: (C) Programmed I/O mechanism has a better CPU utilization than the interrupt driven I/O mechanism

Explanation

Programmed I/O keeps the CPU busy-waiting on the device, so its CPU utilization is worse than interrupt-driven I/O. Statement C is false.