I think sprite zero hit was initially meant for background collision detection purpose, even if probably no game ever used it this way.
If they made it to sync with the video, then why would they have implemented the logic that a non-transparent pixel of sprite zero hits a non-transparent pixel of the BG ?
They would just had to make the bit set as soon as sprite zero is fetched (like Nesticle :p ) and this would have done the trick.
What is Sprite 0?
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