Certain Network Adapters Can Use DMA Channels 0-3 Only

Last reviewed: November 21, 1994
Article ID: Q106274

The information in this article applies to:

Microsoft Windows for Workgroups version 3.11

SYMPTOMS

When you use Microsoft Windows for Workgroups version 3.11 with a network adapter that uses direct memory access (DMA) in Slave DMA mode, only DMA channels 0, 1, 2, and 3 can be used.

NOTE: An example of a network adapter that uses Slave DMA mode is the Hewlett-Packard 27248A EtherTwist card.

If the card operates in Master DMA mode, it can work on any available DMA channel.

CAUSE

This problem is due to a limitation in the Windows for Workgroups 3.11 Virtual Direct Memory Access driver (VDMAD).

WORKAROUND

The only workaround is to use DMA channel 0, 1, 2, or 3 for your network adapter.

STATUS

Microsoft has confirmed this to be a problem in the Microsoft Windows for Workgroups version 3.11 VDMAD driver. We are researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.

KBCategory: kbnetwork kbhw kb3rdparty kbsetup kbbuglist
KBSubcategory: wfw wfwg
Additional reference words: 3.11 hewlett packard HP27248A

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Last reviewed: November 21, 1994
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