Maybe if someone from the MAME team contacted him, he could provide more info on the Micon Series. In the talk he says they found a working one (see the video from 46:05 onward) in the archives of an arcade board rental company in Japan. https://mamedev.emulab.it/undumped/index.php?title=Micon_Block He even said that they almost included a dump of the board in the SNK collection but did not due to it being to late for the release. He says "at least we know where one [of the boards] is. Maybe if more people buy the game [I guess he means the SNK legacy collection] we can do a patch or something...".