DEC disk pacs (and some magnetic tapes) everywhere.
…and some very good regular switches, too.
(I liked the whole hierarchy of toggles in that last photo.)
That’s it! I spent most of the time on the first floor with big machines. There is an entire second floor with a lot of microcomputers, but those were more familiar to me.
This is the website: https://www.mact.io/about_us
It’s currently by appointment. The volunteers were very nice!

Explore this photo album by Marcin Wichary on Flickr!
@mwichary My dad had an old electronic calculator — an enormous thing that must have weighed 20 kg — with a row of 10 or 12 Nixies for the display.
It was fascinating to watch in use, because it was *just* slow enough to see the digits flicker back and forth while it was calculating the answer.