Microsoft's update patch for CodeView (version 4.10.¹ permits you to perform the following three operations that were prohibited in CodeView 4.01:

• You can single-step through code that uses 32-bit registers without losing register values
• Floating point registers can be viewed (using the Window | 8087 menu command)
• You can debug and view source code in .COM files

Right-click here to download a self-extracting EXE file containing the patch.

After downlading the file, run it and click on the Unzip button to extract it to your MASM directory (defaults to C:\Masm615).

If you would like more detailed information about the patch, read the cv41patch.txt file (after you have extracted the update) in your MASM directory.

¹ Thanks to a helpful tip from Andy Skupen of California State University at Dominguez Hills