Direct memory access (DMA) is a feature of many computer systems that allows certain hardware subsystems to access main system memory independently of the central processing unit (CPU). Without DMA, programmed input–output must be used to transfer data which typically fully occupies the CPU for the entire duration of the transfer, and is thus unavailable to perform other work.
Direct memory access (DMA) is a feature of many computer systems that allows certain hardware subsystems to access main system memory independently of the central processing unit (CPU). Without DMA, programmed input–output must be used to transfer data which typically fully occupies the CPU for the entire duration of the transfer, and is thus unavailable to perform other work.
Source: Wikipedia "Direct memory access" · CC BY-SA 4.0
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