Frickin' love the CHM. My only complaint is they have only a few live specimens. But keeping those old beasts working is a challenge in and of itself.
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.