Microsoft KB Archive/165405

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Computer with NeoMagic Display Hangs When PC Card Is Inserted

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Q165405

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The information in this article applies to:


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

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SYMPTOMS
When you insert a PC Card device into a computer running Windows 95 OEM Service Release 2 or 2.1, the computer may stop responding (hang). This behavior may occur on computers that use a NeoMagic display adapter.

CAUSE
During enumeration of a PC Card device, memory reads may be performed at addresses that are not mapped to physical RAM, causing the computer to hang.

RESOLUTION
This issue is resolved by the following updated file for Windows 95 OEM Service Release 2 (OSR2):

  Vmm.vxd version 4.00.1112, dated 7/2/97 11:12am, 408,096 bytes

This issue is resolved by the following updated file for Windows 95 OSR2.1 (USB Supplement):

  Vmm.vxd, version 4.03.1215, dated 8/4/97 12:15pm, 428,576 bytes

STATUS
Microsoft has confirmed this to be a problem in Microsoft Windows 95 OEM Service Release 2 (OSR2) and 2.1. 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 problem is resolved in Microsoft Windows 95 OEM Service Release 2.5 and in Microsoft Windows 98.

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

"Q171284 Problems Enumerating CardBus Devices with No Free IRQs" Additional query words:

Keywords : kbhw win95

Issue type : kbprb

Technology : kbWin95search kbOPKSearch kbWin95OPKOSR2 kbWin95OPKOSR210