https://github.com/mamedev/mame/pull/10264 needs proper inputs (I don't play Mahjong so I don't know what I'm looking for, currently just set to a bunch of switches you can toggle for debug)

[Linked Image from mamedev.emulab.it]

[Linked Image from mamedev.emulab.it]

[Linked Image from mamedev.emulab.it]