Microsoft KB Archive/166422

= Some MicroChannel NIC Cards May Not Start On a Dual Bus System =

Article ID: 166422

Article Last Modified on 11/1/2006

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APPLIES TO


 * Microsoft Windows NT Workstation 3.5
 * Microsoft Windows NT Workstation 3.51
 * Microsoft Windows NT Workstation 4.0 Developer Edition
 * Microsoft Windows NT Server 3.5
 * Microsoft Windows NT Server 3.51
 * Microsoft Windows NT Server 4.0 Standard Edition

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This article was previously published under Q166422



IMPORTANT: This article contains information about editing the registry. Before you edit the registry, make sure you understand how to restore it if a problem occurs. For information about how to do this, view the "Restoring the Registry" Help topic in Regedit.exe or the "Restoring a Registry Key" Help topic in Regedt32.exe.



SYMPTOMS
A MicroChannel network interface card installed in an IBM 520 Server with a dual PCI and MicroChannel bus will not start properly and lists the following in the event log:

  Event ID:    7000 Source:     Service Control Manager Description: The service failed to start due to the following error: A device attached to the system is not functioning.



CAUSE
This may occur if the network card driver's installation routine incorrectly sets the BusType registry key to 5 (PCI) rather than to 3 (MicroChannel). This key is located in:

NOTE: The above registry key is one path; it has been wrapped for readability.

  BusType:REG_DWORD:value

Where xxx is the driver name and y is the driver instance.



RESOLUTION
WARNING: Using Registry Editor incorrectly can cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that problems resulting from the incorrect use of Registry Editor can be solved. Use Registry Editor at your own risk.

For information about how to edit the registry, view the "Changing Keys And Values" Help topic in Registry Editor (Regedit.exe) or the "Add and Delete Information in the Registry" and "Edit Registry Data" Help topics in Regedt32.exe. Note that you should back up the registry before you edit it.  Run Registry Editor (REGEDT32.EXE), find the following subkey:

Where xxx is the driver name and y is the driver instance. Select the Parameters key.  Find and double-click the following Value Name:

Bustype:REG_DWORD:0x5  Change the value to 0x3.</li> Click OK and quit Registry Editor.</li> Shutdown and restart Windows NT.</li></ol>

Additional query words: mca

Keywords: kbprb kbsetup KB166422

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