Xenix has issues with the floppy driver... But you can install Xenix in bochs on a 'raw' disk image, that Qemu will happily run.  Xenix also runs on Virtual PC & VMWare...
I only have 2.3.4 i386 version with no compiler / no networking so it's not terribly usefull.

On Tue, Jul 15, 2008 at 9:45 AM, Michael Kerpan <madcrow.maxwell@gmail.com> wrote:
Great news! I wonder if any other "legacy" Unixes like Xenix or some
of the PC System V ports are working now too?

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