I noticed on the download pages that install under VMWare and VitualPC would work. I had a couple of minutes and got an install under VirtualBox (was Sun, now Oracle).
http://www.virtualbox.org/
Visopsys can be installed under Virtualbox as well
Re: Visopsys can be installed under Virtualbox as well
Yes indeed, thanks for pointing this out. I sometimes use VirtualBox for development, though I mostly use VmWare.