That said, the emulation community exists to preserve history. Many of the arcade boards containing the 186 ROMs are now dead (battery corrosion, capacitor failure). If you own the original cartridges, using NeorageX as a backup device falls under "fair use" for preservation.
Searching for "NeorageX 5 4 186 ROMS" often leads users to this specific title. Garou is the last official 2D fighter from SNK. It features a "Tactical Offensive Position" (T.O.P.) system and some of the most fluid animation on the Neo-Geo. Emulated on 5.4.186, the sound effects of Rock Howard’s Reppuken are flawless. NeorageX 5 4 186 ROMS