Microsoft KB Archive/175590

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Cardbus Cards May Not Work with Vesuvius Chip Set


The information in this article applies to:

  • Microsoft Windows 95 OEM Service Release, versions 2, 2.1


CardBus cards may not work on computer with a Vesuvius chip set.


The Vesuvius PCI IRQ miniport driver (Pcimp.pci) does not support the SetTrigger and GetTrigger functions that report and set level-triggered interrupts. In order for the CardBus bridge to be configured for a CardBus card's memory and I/O windows, CardBus cards require level-triggered interrupts.


This issue is resolved by the following updated file for Windows 95 OSR2, and later versions of this file:

   PCIMP.PCI  version 4.00.1114  dated 9/4/97  7,648 bytes 

To work around this problem, disable PCI Bus IRQ Steering in Device Manager. To do so, follow these steps.

  1. Click Start, point to Settings, click Control Panel, and then double- click the System icon.
  2. Click the Device Manager tab.
  3. Double-click the System Devices branch to expand it.
  4. Double-click PCI Bus, and then click the IRQ Steering tab.
  5. Click the Use IRQ Settings check box to clear it, click OK, and then click OK.
  6. Restart your computer.


Microsoft has confirmed this to be a problem in Microsoft Windows 95 OEM Service Release 2 (OSR2). An update to address this problem is now available, but is not fully regression tested and should be applied only to computers experiencing this specific problem. Unless you are severely impacted by this specific problem, Microsoft does not recommend implementing this update at this time. Contact Microsoft Technical Support for additional information about the availability of this update.

This issue is resolved in Microsoft Windows 98.


For additional information about issues resolved by updates to this component, please see the following article in the Microsoft Knowledge Base:

Q174733 OPTi FireStar Chip Set Not Recognized by Windows 95

For additional information about Windows 95 updates, please see the following article in the Microsoft Knowledge Base:

Q161020 Implementing Windows 95 Updates

Additional query words: chipset

Keywords : kbhw osr2 win95
Issue type :
Technology : kbWin95search kbOPKSearch kbWin95OPKOSR2 kbWin95OPKOSR210

Last Reviewed: January 31, 2001
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