When I studied "computer engineering" (a very long time ago) one of our classes involved hardware debugging on PDP-8 minicomputers (which were old even at the t

When I studied "computer engineering" (a very long time ago) one of our classes involved hardware debugging on PDP-8 minicomputers (which were old even at the time). The lecturer would use a craft knife to make a tiny cut in a PCB trace somewhere in the machine. Then we would write debugging code, use oscilloscope and multimeter etc. to isolate the failure. A blob of solder repaired it. That was such great fun and some powerful learning. It would be great if there was an online game/logic simulator that could do something similar.