Which of the following data transfer schemes requires constant monitoring by…
2018
Which of the following data transfer schemes requires constant monitoring by the CPU of the peripheral devices?
Answer: A. Programmed IO — Programmed I/O, also known as polling, requires the CPU to continuously check peripheral status registers until data is ready. This constant monitoring…
- A.
Programmed IO
- B.
Interrupt-driven IO
- C.
Direct Memory Access (DMA)
- D.
Both, Interrupt-driven IO and DMA
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Correct answer: A
Programmed I/O, also known as polling, requires the CPU to continuously check peripheral status registers until data is ready. This constant monitoring ensures synchronization but reduces efficiency compared to interrupt-driven or DMA methods where the CPU performs other tasks. Thus, Programmed I/O is the scheme necessitating constant CPU monitoring.