If you don't want to go through using the boot disc, you might want to try Pentagram, which allows Ultima 8 Pagan to be run on modern operating systems.
I reccommend the boot disk though, as Pentagram is still in its early beta stages, and you might encounter problems (you can see for yourself what those problems are on the site) it's up to you to choose.
http://pentagram.sourceforge.net/index.php