PC Card Modem Does Not Use Assigned Interrupt (225151)


The information in this article applies to:

  • Microsoft Windows 95
This article was previously published under Q225151

SYMPTOMS

A PC Card (PCMCIA) modem may not always be assigned the same IRQ resource, even if the "Use automatic settings" check box in Device Manager is cleared. If the "Use automatic settings" check box is cleared and the IRQ assigned to the modem is the only available IRQ, the modem may not work. When this occurs, the modem shows a status of "Code 10" in Device Manager.

CAUSE

CardBus Services (Cbss.vxd) includes an interrupt detection mechanism that asks the device to assert an interrupt, and then checks the Programmable Interrupt Controller. The check may be carried out faster than the hardware can respond, and the returned availability of an interrupt for the device may not be valid.

RESOLUTION

A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that this article describes. Apply it only to systems that are experiencing this specific problem.

To resolve this problem, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

The English version of this fix should have the following file attributes or later: 
   Date      Time    Version      Size    File name
   ------------------------------------------------
   04/02/98  11:18am 4.00.1118    16,249  Cbss.vxd

STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.

This problem was corrected in Microsoft Windows 98.

MORE INFORMATION

To view a device's resources:
  1. Click Start, point to Settings, click Control Panel, and then double-click System.
  2. On the Device Manager tab, click the device whose resources you want to view, and then click Properties.
  3. Click the Resources tab.
Modification Type:MinorLast Reviewed:10/18/2005
Keywords:kbHotfixServer kbQFE kbprb KB225151
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