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The method which offers higher speeds of I/O transfers is ___________

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The method which offers higher speeds of I/O transfers is ___________

(a) Interrupts

(b) Memory mapping

(c) Program-controlled I/O

(d) DMA

This question was addressed to me during an interview for a job.

This key question is from Accessing I/O Devices in section Input/Output Organisation of Computer Architecture

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Correct choice is (d) DMA

The explanation is: In DMA the I/O devices are directly allowed to interact with the memory without the intervention of the processor and the transfers take place in the form of blocks increasing the speed of operation.

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