> This was added to mame in the 1990s. The fact that f205v dumped bootlegs that had
> 100% data matches doesn't mean what you think it does.
set 1 has been dumped from a board with official Tehkan markings
the bootlegs of this game are pretty much 1:1 clones of the original PCB, so not too surprising some of them use unmodified code.
f205v just provided verification of the rom data, what was on his bootleg matched the original set.