This worked corrrectly with early (5.0.10) versions, but the current version detects a non-PNP BIOS as PNP. Therefore it doesn't hook int 19h and doesn't come up. I guess I can try the -forceINT option as a workaround?
Correction: I never tested the official ROM version on this PC. I was using the version posted to the forum, before the first working official ROM version. It was in the BIOS so I never updated it until now.
I used the -forceINT option and it works.