Now why couldnt they tutor explain this? She made out there were was only one type of DMA, or rather, failed to mention there were 2.
Perhaps because she was speaking of DMA from a conceptual standpoint or from the standpoint of what it fundimentally involves (how it operates) regardless of the actual implementation? Maybe because the older/conventional type of DMA has/is quickly going the way of all flesh? Don't know.
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