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[ The PC Guide | Systems and Components Reference Guide | Motherboard and System Devices | System Resources | Direct Memory Access (DMA) Channels ]

DMA Channel Details By Number

This section lists each of the 8 DMA channels and provides a full description of what they are, how they are normally used, and any special information that is relevant to them. The general format for each section is as follows:

  • Channel Number: The number of the DMA channel from 0 to 7.
  • Bus Line: Indicates whether or not this DMA channel is available to expansion devices on the system bus. This will say "8/16 bit" for DMA accessible by all expansion devices, "16 bit only" for a channel available only to 16-bit cards, or "No" for a channel reserved for use only by system devices.
  • Typical Default Use: Description of the device or function that normally uses this DMA channel in a regular modern PC.
  • Other Common Uses: This is a list of other devices that commonly either use this channel or offer the use of this channel as one of their options. This list isn't exhaustive because there are a lot of oddball cards out there that may use unusual DMAs.
  • Description: A description of the channel and how it is used, along with any relevant or interesting points about it or its history.
  • Conflicts: A discussion of the likelihood of conflicts with this DMA channel and what are the likely causes.

Next: DMA0


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