I have a digital AlphaServer 1000 4/200 I would LOVE to load OpenBSD on. I haven't succeeded yet. It is happily running FreeBSD currently. I'll give OpenBSD another stab soon though :)
I run OpenBSD on my little laptop which is a pentium 100 maxed at 40 megs of ram. Runs like a champ. I use it as a portable terminal, among other things.
