@Gona, I have yet another test app for you. This runs in protected mode. The run.bat redirects output to out.txt. That probably isn't necessary because the app dumps everything to a file separately. I think you'll have to remove the > out.txt. This *might* just switch your vlb card into graphics mode and take over the display and not exit cleanly. Most probably it won't do anything at all.

If you run it directly this is what you need to use:
dos32a 3dbvlb32 1

https://nirvtek.com/downloads/3DBVLB32.20260512.001.7z
MD5: 4846735a8e12dd7415555a3b81fc75ec