[ 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
- 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.
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