R. Belmont: Very sure it's either "present" or "read allow" (more towards the latter if crazyc is right), because it's entirely consistent with how the system works. If this was an "accessed" bit, there would still have to be another present/read allow bit somewhere for the MMU to really make sense.
Just Desserts/crazyc: Possible, but I didn't actually spot any page getting (intentionally) written when the bit wasn't set, at least once the MMU was enabled. Very possible that I missed something. If so, "read allow" seems to be the simplest interpretation (I assume that even then the pages were not intentionally read before the bit was set.)
Last edited by anyfoo; 08/03/20 03:47 AM.