I'm curious about something: is this game truly a bootleg?
The reason that I ask is that it was released by a licensee of the original (Gremlin/Sega). Wouldn't that just make the game an update of sorts, rather than a bootleg? Midway did something similar with Space Invaders 2 cocktail, where it was an in-house project rather than a release of Taito code.
There are pictures of the cabinet around, and they all look quite official (i.e. not shoved into a generic box). Electronic Games even mentioned it (with cabinet photo) in an issue of the magazine back in the 80s...
... or is the set that MAME supports from an actual bootleg of SMC?
"One of these days, I'm going to cut you into little pieces!"- Nick Mason, Pink Floyd