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Describe the importance of DMA controller. Explain method of interfacing 8257 DMA with 8086 microprocessor.
written 5.6 years ago by gravatar for meghalikalyankar meghalikalyankar • 2.2k •   modified 4.6 years ago
microprocessors and peripherals
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written 5.6 years ago by gravatar for meghalikalyankar meghalikalyankar • 2.2k
  • DMA Transfer is a hardware controlled I/O Transfer technique. It is mainly used for high-speed data transfer between I/O and Memory where the speed of the peripheral is generally faster than the µP.
  • In Program Controlled I/O, Status or interrupt driven I/O the speed of transfer is slow mainly because …

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