Currently looking (again) at the Multi Amenity Cassette System, a Japanese Arcade System developed by I’Max in 1995. First off, I’ve removed the existing hacks in the driver and implemented BIOS support and basic BIOS/cart ROM bankswitch.

First effect of this is improved logic in Kisekae Mahjong, that boots, runs some attract mode and it’s playable until it resets in the middle of the gameplay (still investigating on it):

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