Because Neo Geo roms can come in different formats (split or non-merged), it's recommended to keep the neogeo.zip bios in both the /BIOS folder and the /Roms/NEOGEO folder to ensure best compatibility.
The GnGeo is an AES/MVS Neo Geo emulator (without NG-CD support) based of MAME ROMsets.This emulator is a standalone emulator (not Retroarch core) which natively supporte GNO files.GnGeo is interesting because of loading times. Tested a few big games like kof2000 and it starts just a few seconds instead of 45 seconds. The framerate is also very good.
c80f0f1006