MAME-NES v1.8 is released. This branch contains a major NES/Famicom accuracy update for MAME. The main M6502/NES CPU timing path, APU, and PPU have been heavily reworked toward cycle-accurate behavior. The goal of this work is to improve hardware accuracy while keeping the implementation compatible with MAME's existing NES/Famicom architecture.

MAME-NES Changelog:
Applied my NES Accuracy code to mame0289 code base. Major upgrade from mame0260 code base.
With the help of AI on this one to save a shit load of time in merging crap.

Download: MAME-NES v1.8
Source: Here