A lot of debugging time went into this and a race condition was found during the messaging between the 2 CPUs.
With the fix, a whole of various emulators became stable to work with. So also with the inspiration I got from https://www.youtube.com/channel/UCqnVlRIiPVJsU2SqsfVwV3w here's a short video with different emulators.
1) AmiGeneratorT / Mortal Kombat II
2) DarcNes / Double Dragon
3) AmiGeneratorT / Sonic
4) WarpScummVM / DOTT
5) MAME / 88Games
6) UAEWOS / AIBB on LSD101 disk
7) WarpSNES / SuperMario World.
Some stuff is not optimized yet. ScummVM is accessing a lot of FAST memory still which maybe can avoided as each access is a context switch. Sound with Double Dragon is a bit weird in the menus, but I have seen this on a BPPC too.
Sorry for such a bland WB, I forgot to place my WB picture back after tests with WarpDT (no, not working yet). Also I really should install a silent fan into that A3000.
And see if you can spot the growling cat during the movie ;-)