CPU time is a valuable computer resource that should be used as effectively as feasible.   Why does DMA use less CPU power than interrupt-driven and programmable I/O?

Systems Architecture
7th Edition
ISBN:9781305080195
Author:Stephen D. Burd
Publisher:Stephen D. Burd
Chapter11: Operating Systems
Section: Chapter Questions
Problem 16VE
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CPU time is a valuable computer resource that should be used as effectively as feasible.

 

Why does DMA use less CPU power than interrupt-driven and programmable I/O?
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