I went to the "Technische Sammlungen Dresden" yesterday after some colleagues told me to have a look:
http://www.tsd.de/en/
The computer exhibition is not super large (about one floor in a industrial building) and focused on Robotron computers produced in eastern Germany and typewriters. But I still found a gem or two for my audience here, I believe
First, moving in chronological order, here is the quite impressive typewriter collection:

- typewriters.JPG (964.12 KiB) Viewed 2380 times
And here is a picture of a hansen writing ball. I think we had a discussion about these things earlier this year.

- Hansen writing ball.JPG (649.9 KiB) Viewed 2380 times
They also feature some earlier calculators, some mechanical and some electrical. I really like this one, a Archimedes calculator built in Glashütte.

- archimedes calculator.JPG (687.63 KiB) Viewed 2380 times
Ok, here finally is one for all the IBM fans: A really early card puncher keyboard

- ibm card puncher.JPG (791.43 KiB) Viewed 2380 times
And for all the VR and 4K crowd: This is what a monitor looks like

- laughing at 4k.JPG (612.03 KiB) Viewed 2380 times
As I said, a large part of the exhibition is focused on Robotron computers. The keyboards on these are underwhelming unfortunately, but some look really cool.

- robotron 1.JPG (621.73 KiB) Viewed 2380 times

- robotron 2.JPG (621.82 KiB) Viewed 2380 times
At the end of the hall there are some racks with further computers. I think (hope) the exhibition will be reorganized in the future, and these will get a proper place as well. Anyway, this is were the gems for us mechanical keyboard lovers are hidden.
First up is a portable Highscreen computer with a nice detachable keyboard. MX blues master race

- highscreen mx blues 1.JPG (570.97 KiB) Viewed 2380 times

- highscreen mx blues 2.JPG (544.94 KiB) Viewed 2380 times
And finally my personal highlight: A nice Xerox computer. E3E did a nice tear down and restoration thread on these keyboards:
photos-f62/xerox-docutech-keyboards-and ... 13229.html
The keyboard seems to have a broken switch in the top right corner, I didn't dare to repair it on the spot

- xeros 1.JPG (613.1 KiB) Viewed 2380 times

- xerox 2.JPG (578.69 KiB) Viewed 2380 times
Thats it. If you have any keyboard gems hidden in your museum, feel free to share
