Running NetBSD on a VAX
From Computer History Wiki
First of all, if you want to run this on SIMH, the NetBSD people already have a great guide for you at [1]
First of all, check whether your VAX can even run NetBSD: check out http://www.netbsd.org/Ports/vax/ and scroll down to Supported Hardware Models. You'll also want to check whether your ethernet card and graphics (if any) are supported as well as your various drives.