PRB: Visual C++ Debugger Can Fail on Pentium III Computers (234620)

The information in this article applies to:

Microsoft Visual C++, 32-bit Enterprise Edition 6.0
Microsoft Visual C++, 32-bit Professional Edition 6.0
Microsoft Visual C++, 32-bit Learning Edition 6.0

This article was previously published under Q234620

SYMPTOMS

While debugging a DirectX application in the Visual C++ debugger on a Pentium III computer, you can get the following error:

Unhandled exception in D3DIM.DLL 0xC000001D: Illegal instruction

If you run the application outside the debugger, it may run without an error.

CAUSE

On the Pentium III, exceptions are unmasked when debugging. This produces an error "Unhandled Exceptions" or "Illegal Instructions" error in Windows 98.

RESOLUTION

The fix requires an updated version of VMCPD.VXD. You can get this file by contacting Microsoft Technical Support at:

http://www.microsoft.com/support/

Copy the file to the WINDOWS\SYSTEM directory and restart the computer.

The updated version of the file is included in the Windows 98 update available for free download from the Microsoft internet site.

Modification Type:	Major	Last Reviewed:	11/18/2003
Keywords:	kbBug kbDebug kbpending kbprb KB234620