For RetroArch (specifically FBNeo), you need Non-Merged ROM sets.
Billinear filtering (blur) looks bad. Use CRT Shaders.
The Neo Geo hardware, created by SNK in the early 90s, holds a mythical status in gaming history. It was "arcade hardware for the home," offering pixel-perfect ports of titles like Samurai Shodown, Metal Slug, and The King of Fighters. neo geo roms for retroarch
Today, RetroArch is widely considered the best way to experience these games on modern hardware. However, Neo Geo emulation is unique because of its "BIOS" requirement. Unlike a standard SNES or Genesis ROM, Neo Geo games require specific system files to function.
Here is everything you need to know to get Neo Geo running in RetroArch. For RetroArch (specifically FBNeo), you need Non-Merged ROM
For FBNeo or HBMAME, you need a specific set of BIOS files. They must be placed inside RetroArch’s system folder (not the ROMs folder).
The universal Neo Geo BIOS files are named: Inside this neogeo
Inside this neogeo.zip archive, modern cores look for specific CRC checksums. The safest version to find is the UniBIOS. The UniBIOS is a homebrew replacement BIOS that allows you to switch console modes (AES vs. MVS), enable cheats, and bypass region locking.