Which I/O technique allows a device controller to transfer a block of data directly between an I/O device and main memory without continuous CPU intervention?
Options
- A. Polling
- B. DMA
- C. Spooling
- D. More than one of the above
- E. None of the above
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Quiz Practice:
Correct Answer (Detailed Explanation is Below)
B. DMA
Detailed Explanation
Explanation: DMA (Direct Memory Access) allows a DMA controller to transfer data directly between an I/O device and main memory. The CPU is not required to handle every individual byte or word, which reduces CPU overhead and improves I/O performance.