I had to use Previous 0.5 that is in the NS3.3 HD image on winworldpc.com. I was able to get it working although slowly, I only use max 64MB RAM and stick with greyscale for speed (I think it is faster than full colour). I think the Virtual Box version is slightly faster but I think that is because a lot less hardware is being emulated and there are less registers to emulate on 80486/80586 compared to a MC68040. But it works which is the main thing so I can re-install Sybase again and have another go with that.
You are brave and maybe a little insane.
Have we ever found a full four-disk set of Sybase?