PC Card Modem Does Not Use Assigned Interrupt

• Microsoft Windows 95

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 fix that corrects this problem is now available from Microsoft, but it has not been fully regression tested and should be applied only to systems experiencing this specific problem.

To resolve this problem, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information on support costs, please go to the following address on the World Wide Web:

http://www.microsoft.com/support/supportnet/overview/overview.asp

   Date      Time    Version      Size    File name
   ------------------------------------------------
   04/02/98  11:18am 4.00.1118    16,249  Cbss.vxd 

STATUS

Microsoft has confirmed this to be a problem in the Microsoft products 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.

Additional query words: failure pic

Keywords :
Version : WINDOWS:95
Platform : WINDOWS
Issue type : kbprb