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http://www.michna.com/kb/WxDMA.htm

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• DMA Reverts to PIO
  DMA is an abbreviation for Direct Memory Access, an access method for external devices where the data transfer is not done by the central processor, but by a small special processor called DMA controller. It uses a procedure called cycle stealing, where the central processor memory access cycles are delayed for very short times to intersperse DMA controller memory access cycles. Some newer, faster DMA modes are called UDMA (Ultra DMA).
  By kfvd in Public bookmarks with dma abbreviation memory access method external devices data

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