To those who haven't visited the Computer History Museum (Mountain View, CA), it is SO AMAZING!!! If you ever happen to be in the US/California, go spend a few hours in there. It is a wonderful place!
The Centre for Computing History in Cambridge (UK) explains as you go in that says unless there's a sign, you can play with anything you see. There's clearly an expert for each machine, so they are set up with who has games, word processors, educational software, a banking back-office (??), typewriters... so much more exciting. The star exhibit is the megaprocessor https://www.megaprocessor.com/progress.html - which has Tetris hooked up.