I appreciate Your work, as usual
1. Horizontal tab shows horizontal and vertical games. And Vertical tab shows only few games on list.
2. I've updated Arcade with all files from new MAME, added hiscore.dat v190 from Leezer and when I try to run PC-10 game, I see error:
with original hiscore.dat from MAMEDEV or previous v189 from Leezer no errors.
My hi-score config in Arcade: