It sounds like you’re referring to FB Alpha (FBA), the emulator for arcade games, and specifically looking into the ROM set version v0.2.97.29.
OnionOS/Miyoo Mini: It is the recommended ROM set for the arcade cores used in popular custom firmware like OnionOS.
NeoGeo: Generally provides better boot times and stability for SNK titles compared to some MAME cores.
Purpose: This set ensures that arcade games run reliably on emulators that use the older v0.2.97.29 codebase, which is often optimized for performance on portable hardware.
CPS1, CPS2, & CPS3: Capable of running heavy hitters like Street Fighter III: 3rd Strike at near-full speeds on supported devices.
Released around June 2013, it focused on improving sound support and transitioned to MSVS2012 compilation. Supported Arcade Systems
neogeo.zip file is missing, incorrect, or in the wrong folder.neogeo.zip (MD5 usually validated by the core) into your RetroArch system folder.