Atari 400 or other

[Vectrex]

Hi, after an Atari 400 to use in my little school expo. I don't have any membrane keyboards to show. The kids needs to know the suffering!
Also after any other models/interesting old computer stuff.

See photos here if you're curious. This was my first test set up in the local hall and I'd like to expand it to mostly computers (got to keep the Vectrex in though )
https://drive.google.com/drive/u/0/folders/0B9ZfDQtV5N8XZ0Fqb01YSl81c2M