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Table Of Contents  CertiGuide to A+ (Core Hardware)
 9  Chapter 0001:  Power Supplies - System Board
      9  XV  Demanding Attention Digitally

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DMA, the PC and the AT
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XVI  DMA and Bus Mastering

Going back to the CPU and using interrupts to move data from one sub-system to another sub-system is not very efficient. The solution comes from the use of Direct Memory Access (DMA) channels.

By creating DMA, designers enabled devices to cut out speaking directly with CPU, leading to increased performance. DMA channels were created along with the appropriate circuitry to control them. This is another example of circuitry that was absorbed into the chipset.


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