Someone managed to run a single game using this core (x86_64)?
Yes I did. Your MAME roms must be managed with ClrMamePro and updated to the MAME 0.220 compatibility level. If you own the MAME 0.220 fullset you have to know that some game arent emulated yet. So keep only roms setted as working in MAME.
Thanks for your reply! It looks that it was the rom compatibility level problem. Anyway MAME 0.220 in Batocera works a lot slower than libretro 0.139 core. Additionally it does not see mouse, so rotary or trackball won’t work.