By rainwarrior, based on an earlier diagram by Damian Yerrick. See Category:Nametable mirroring diagrams for generation program.
Screen A is now overlaid on top of screen B for a more compact diagram. This hides the letter B, but proximity to similar diagrams at Mirroring should disambiguate is meaning. The colour seems to be identifiable through colour-blindness simulation tests as well.
Categories: Nametable mirroring diagrams