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What is the role of DMA controllers in microprocessor based systems?
Wiki User
∙ 14y ago
A DMA (Direct Memory Access) controller is a device that can request control of the memory bus from the CPU, and then transfer data to or from memory without the support of the CPU. It is often used in high speed I/O, such as hard drives, because polled and interrupt modes incur too much overhead.
Wiki User
∙ 14y ago
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