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jsgroth / jgenesis

Sega Genesis / Sega CD / SNES / Master System / Game Gear emulator
MIT License
58 stars 3 forks source link

LEGO Racers (Europe) (En,Fr,De,Es,It,Nl,Pt,Sv,No,Da).gbc freezes up on the language select screen #29

Closed benderscruffy closed 4 months ago

jsgroth commented 5 months ago

This game seems to work mostly correctly after the fix for #27, but there's a bit of flickering during gameplay which I think is probably related to incorrect PPU mode 3 timing.

jsgroth commented 5 months ago

The flickering colors during gameplay were caused by blocking CPU access to VRAM + CGB palettes one M-cycle too early. The timings sometimes line up such that the game finishes modifying palettes exactly on the last possible M-cycle before the PPU starts rendering pixels.