How exactly does Direct Memory Access (DMA), as its name suggests, improve the system's ability to handle several threads at the same time? How exactly does this stymie efforts to develop new pieces of hardware?

Systems Architecture
7th Edition
ISBN:9781305080195
Author:Stephen D. Burd
Publisher:Stephen D. Burd
Chapter11: Operating Systems
Section: Chapter Questions
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How exactly does Direct Memory Access (DMA), as its name suggests, improve the system's ability to handle several threads at the same time?
How exactly does this stymie efforts to develop new pieces of hardware?

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