How Inaccurate are Nintendo's Official Emulators? (2025, 15m17s)

The video format is really unfortunate with how much text there is. You will spend much more than 15m17s watching the video if you pause to read all the details, but I included it in the title to push my agenda anyways.

Anyways, as for the video itself - it's much more interesting that I expected based on the title. The author wrote their own pretty comprehensive test ROM, discovering new obscure NES behavior along the way. In 2025! No emulator passed all the tests.. except the author's own emulator, but that doesn't count :p I'm not a NES dev, so a lot of this went over my head, but I still found this all pretty darn interesting.

edit: The author seems to have a bunch of other videos on technical NES stuff if you're into that sort of thing :) There's e.g. a 31m34 explanation of how they made a TAS that plays Bad Apple in Super Mario Bros. Cool stuff!