In article <bbdc5d83.0308160735.72d16f44@posting.google.com >,
drkirkby@ntlworld.com says...
> I've installed Solaris 2.5 (yes don't laugh) on a SPARC 20 via a
> serial port.

Laugh?

There are still serious military control systems running on 2.5.1.
(Heavily patched and fortified with loads of custom software, of
course.)

It may be old and crusty, but's still very important in certain circles.