Well, there is the collection of three mainframes up
in Portland, I
don't have the URL handy. Problem is, those things are at best
semi-portable, i.e. it takes a big damn truck.
Mainframes might be a bit too much to take around to shows,
unfortunately. I think the artifacts would be in too much danger of
being damaged.
Minis are a different story. I think a deracked PDP-8/e or PDP-11/20,
with a teleprinter, would be very reasonable.
William Donzelli
william(a)ans.net