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

"Missing BIOS / Required files are missing"