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Channel Number: 0
Bus Line: No
Typical Default Use: Memory (DRAM) Refresh.
Other Common Uses: None; for system use only.
Description: This DMA channel is reserved for use by the internal DRAM refresh circuitry. Dynamic RAM (used for system memory on almost all PCs) must be refreshed frequently to make sure that it does not lose its contents. DMA channel 0 is used for this purpose and is not available for use by peripherals.
Conflicts: Most devices stay far away from DMA0, recognizing its use by the system. Beware however, as some devices actually offer DMA0 as an option. For example, some sound cards do. Do not use DMA0 for peripherals. If you have no devices set to use DMA0 but a conflict becomes apparent anyway, it could be a problem with your motherboard.