This would never have existed on any real PDP-1. Well, it could have, but only on separate monitors. The standard Type 30 and the Type 340 happily coexist in my world. I could artificially restrict it to having to be on 2 different displays, but that would be annoying.
Bill
PS - this one is a png, not a jpeg. Is it a format that everyone can see? The same image as a jpeg is 9 times the bytes!
Bill