Should be taken with a colossal grain of salt, but an engineer has started piecing together a Toaplan V2 core specifically for Battle Garegga, but could potentially run such hits as Batsugun, Batrider, Truxton 2 and BRAIN WASHING GAME Teki Paki
I wouldn't normally get excited over some twitter guy saying he's doing stuff, but he seems very skilled technically and is knowledgeable of arcade hardware (and gaming!) in general, and is specifically refusing to accept donations or create a patreon. His motivation primarily seems to be that he wants to save the space and hassle of hooking up his real Garegga PCB, which is a solid flex and fuckin' rules lmao.
Also, he's focusing on recreating one single game that he owns (Garegga) so hopefully he's detail orientated and really strives for true 100% accuracy before hopping over to another platform like Jotego does (who does incredible work, but there always seems to be one or two minor issues per core that make me hesitant to say they're 100% accurate). He also mentions another nice side-effect of Mister in general - most of the important ICs he needs already have FPGA implementations, and barring a couple more he'd need to analyze the bulk of his work will be routing and connecting these chips together. That's why even though I think Robocop is overrated and the memes are the only value Bad Dudes has, the work on those cores might carry forward to Data East games I enjoy more, like, uhh I dunno, Edward Randy or something