SvarDOS
UDVD2 + SHSUCDX makes the system freeze on boot
Happens on VMware and an emulated Pentium system. So chances are that it is a general compatibility problem.
System freezes when SHSUCDX opens the UDVD2 device driver https://github.com/adoxa/shsucd/blob/f905b43436107b9238c11d5f9a1759c98eb5cc7d/shsucdx.nsm#L2959
This runs fine when launched from SvarCOM after installing lDebug with install indos, tsr. It hangs when running directly under lDebug with ldebug C:\svardos\shsucdx.com /D:SVCD0001, then install indos and g. Likely some stack corruption going on? Have to single-step...
This thing behaves very randomly when running under lDebug. Single-stepping through its source makes it run perfectly. Simply running it via g, likely results in stack corruption (sometimes)?!? At least IP goes wild at some point...
However, I tested with the newest UDVD2 version from the FreeDOS repo. This seems to be newer than the one shipped with SvarDOS. It does not seem to be affected from the bug.
So I will update the package, and hope that the updated version indeed fixed this. If not I will have to revisit this...