Which of the following data transfer modes between CPU and I/O devices has the…
2022
Which of the following data transfer modes between CPU and I/O devices has the data transfer initiated by the instruction of a computer program executed by the CPU?
- A.
Programmed I/O mode
- B.
Interrupt initiated I/O mode
- C.
Direct Memory Access (DMA) mode
- D.
Direct Register Access (DRA) mode
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Correct answer: A
Programmed I/O is the correct mode because it requires the CPU to execute specific instructions to manage data transfer directly. In contrast, Interrupt-driven I/O relies on hardware signals to initiate transfers, while DMA uses a dedicated controller that bypasses the CPU for data movement.