Sprite limit in NES core


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Sprite limit in NES core

Postby hyperterminal » Sun Dec 31, 2017 4:04 pm

The NES PPU has a sprite limit of 8. Some games, mostly unlicensed of homebrew games (such as Kart Fighter or this Donkey Kong port) utilize more than 8 sprites at the same time, causing sprite flickering. This can be fixed by increasing the sprite limit to 16. The RetroUSB AVS and Kevtris' Analogue Nt Mini/Hi-Def NES have such an option. I am not sure if such an option is necessary for compatibility reasons or if it is acceptable to permanently change the sprite limit from 8 to 16.

This file from the NES core would need to be changed: https://github.com/mist-devel/mist-boar ... /src/ppu.v

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Re: Sprite limit in NES core

Postby Newsdee » Mon Jan 01, 2018 12:51 am

This also fixes flickering on some games such as the life bar in TMNT 1. Worth doing, albeit a very specific change so not sure how much work it would be.

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