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ares-emulator / ares

ares is a cross-platform, open source, multi-system emulator, focusing on accuracy and preservation.
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[Sega Mega Drive] Graphics issue with certain Public Domain ROMs #1642

Open freq-mod opened 2 months ago

freq-mod commented 2 months ago

Describe the issue Out of this repository (https://www.planetemu.net/roms/sega-mega-drive-public-domain?page=0), there are a few ROMs that fail on emulators. On ares, prime example is Flavio's Raster Effects Test (PD). On real hardware, this ROM displays an image of a Native American man, hitting Start button cycles between different raster effects applied on the image. On ares, a gray screen with black lines are displayed instead.

Rom Information

file: Flavio's Raster Effects Test (PD).bin
sha256: 3c50109798a2ffb5092c58bb70fcc6d9109555b76fe2691a7e5fb1ff85d1f51c
remutro commented 6 days ago

Flavio's Raster Effects Test (PD) does work properly on Kega Fusion 3.64 & Gens 2.14

getCursorsExe commented 1 day ago

Flavio's Raster Effects Test (PD) does work properly on Kega Fusion 3.64 & Gens 2.14

Apparently this is NOT correct behavior. Trying to load this ROM into accurate emulators will also show the same black lines, indicating that this ROM relies on emulation inaccuracies, meaning the image is never displayed on hardware. This means that Ares gets it right.

freq-mod commented 1 day ago

And since when BlastEm is 100% transistor-accurate simulator of a Mega Drive or even any kind of a benchmark?

I checked on MY real console - black dotted lines are NOT a correct behavior. Else, I wouldn't open this issue ticket.