S3 Video Driver Conflicts with COM4

ID: Q127138


The information in this article applies to:


SYMPTOMS

When you are using a modem on COM4 in Windows 95/98, the modem lights may flash when you move the mouse or when there is any disk or network activity.


CAUSE

Some of the older video chip sets by S3 decode the x2E8 address range incorrectly with the I/O address mapping performed in Windows 95/98. These chip sets include the 801, 805, and 928 versions.

The following video cards are known to cause this behavior:


RESOLUTION

To correct this behavior, use any one of the following methods:

For information about how to use the slider to change the way Windows 95 uses the video card, please see the following article in the Microsoft Knowledge Base:
ARTICLE-ID : Q127139
TITLE : Troubleshooting Video Problems in Windows


MORE INFORMATION

This problem may not occur with the 964/984, trio/64/32, or 866/868/968 chip sets and does not occur with any newer chip sets released by S3.

Additional query words: 95 98


Keywords          : kbdisplay win95 win98 
Version           : WINDOWS:95,98
Platform          : WINDOWS 
Issue type        : 

Last Reviewed: January 15, 1999