I had a similar experience with a diagnostic machine at my high schools auto shop. That thing had just been sitting around for like a decade before I figured out how to get it going for the teacher. I had been using dos since before I can remember to play games on my dad’s PC. I didn’t understand a ton of it because he just gave us a notebook with the commands to type to start the game but I think starting with it so young really helped wire my brain for using computers because when I came back to it when I was older everything just clicked.