This one is slightly different to the one i've seen, maybe yours is an older version:
http://www.happy-manor.com/itm/459260/71605/Arcade-PC-Board/KONAMI/Bloody-Roar-II-PC-K106
Bad news about the surface mounted rom, your one has some of the program in the SMT MX chip instead of 2x 160's.
The 27c160 in the socket should be dumped anyway, maybe Coolfox or someone will be up for dumping the tricky one (i have no adapters).
Looks like the atmel has a security bit, that's a bummer.
Good news is that it's spoofing the security using only 2 wires?!?
And the atmel looks like it's controlling the OKI. and not the protection?
Maybe it's simpler than copying the chip anyway.
With a hack that simple it's more than likely a code patch with the bare minimum connected in place of the chips for the board to function.
Has the mainboard surface mounted bios been changed?