I had nothing to do this night, so I gave a try to qemu. This is really interesting.

I have installed a NetBSD 2.0 system, and it worked. Since I did not have any usage of this, I decided to do something I can't do usually:
abydos-qemu ~ # rm -rf /
abydos-qemu ~ # ls
zsh: command not found: ls

Amazing ! :-D