Someone suggested this website in a reddit comment and I took a look into it. Its quite an amazing project. You can walk around and interact with a computer from the 1960’s, The IBM 1401.
You can program punch cards, save to tape, and more.
There are little info buttons that teach you the controls. The program can even save your work.
There is also cat that walks around, taking the experience to another level.
The creator of this project also has a YouTube with info about how to program on the IBM mainframe, but also how he does unity stuff, and other demos. https://www.youtube.com/c/rolffsonsIBM1401channel/videos
You can download the Unreal simulation from his website: https://rolffson.de