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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 ]


Channel Number: 3

Bus Line: 8/16-bit

Typical Default Use: None.

Other Common Uses: ECP parallel ports, SCSI host adapters, tape accelerator cards, sound card (low DMA), network cards, voice modems.

Description: This DMA channel is normally the only one free on the first controller (DMAs 0 to 3) when you are using a sound card. As a result, it is probably the "busiest" channel in the PC, with many different devices vying for its services. One of the most common uses of this channel is by ECP parallel ports, which require a DMA channel unlike other parallel port modes. On very old XT systems, DMA channel 3 is used by the hard disk drive.

Conflicts: DMA3 is probably the worst channel in the system for conflicts, because so many devices try to use it. It is important to watch for conflicts between multiple devices here, particularly if you are using a sound card or ECP parallel port. More general solutions to resource conflicts can be found in the conflict resolution area of the Troubleshooting Expert.

Next: DMA4

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