Incorrect, large OAM implementation

[agg23]

The MiSTer core has an extremely large OAM implementation that does not mirror the hardware at all. It wastes a ton of space and does simultaneous access to many addresses at once, requiring it to be implemented as a massive register instead of RAM. This consumes around 27% of the Pocket's resources.

This was introduced in MiSTer-devel/NES_MiSTer@922cdcb, which added extra sprite functionality to the core.

[dfilskov]

Could it be optimized while retaining the extra functionality?

Great work btw!

[naveedster]

Will there ever be save states and a video crt scanline filters?

[agg23]

Could it be optimized while retaining the extra functionality?

Theoretically, yes, but you have to design it very carefully for that purpose, which may be quite difficult given you're shoehorning in another 8 sprites while maintaining the same cycle timings. I would probably be more likely to drop the feature and have a more complete core, but I realize the extra sprite feature is very useful for NES.

[agg23]

Will there ever be save states and a video crt scanline filters?

This is extremely off topic, so I will only allow this once, and future comments of this sort will be deleted.

The core already supports savestates, and video filters will come when Analogue releases general support for them.

[RndMnkIII]

Should be fixed with PR #56