neogeo
metal slug 1 would not play. In batocera Retroarch does not have load content or load core. Instead this is all inside of Batocera. Select metal slug 1 in batocera. Press select.Advanced Syustem Options.Rumble Level -> OFFRewind -> OFF. This fixed it.Not sure which one. Probably rewind since that requires more ram.Any games with issue do this to ensure rewind is off.
Back to not playing. I cycled through all emulators and messed with setting then it started working until reboot.
fbNEO is flakey on this batocera build.