Are you sure?
www.netbsd.org/Ports/ still lists it as a "Suggested" Port, not
even a non-integrated one.
While it has only been recently integrated, and support is minimal, the MCA
bus is now official in the i386 port. Linux has been quite happily embracing
the Personal System/2 for quite a while now.
Linux I have no trouble with, but NONE of the PS2 games I have purchased
recently have worked at all on my 9595 PS/2.