> Bonky dumped a version of Street Fighter II World Warrior that has rom labels > identical to the final 920312 but it boots as 911210. Shoutime got a World Warrior > that also boots as 911210 and with similar L letter revisions on the program roms but > with a couple of slight differences. So it appears that near the end of the life > cycle of World Warrior, Capcom started caring less and less about updating the boot > screen date and giving sets their own rom label revisions. Either way there are new > sets coming soon to mame.
There's also a fair chance that some of the sets (maybe the 'newest' one) are actually hacks, with somebody hacking them up in order to sell them to ops with a fake date using original labels, or even to get somebody interested in emulation to pay over the odds for them.
It happened a lot with Fruit Machines (But for other reasons, convince an operator that a version you're offering to install is a legitimate new version when actually it contains a payout backdoor) I guess for CPS1 it might happen if somebody wanted to hack them to use a different sub-board but still make them look official. The variations in sub-boards needed by some games (including SF2) is a bit weird already. Bugfixes were meant to be easy romswaps, not 'replace entire sub-board as well' because that's not cost effective and would actually increase piracy not decrease it as additional spare sub-boards would end up on the market that could be used for other bootlegs/conversions.
The code probably needs looking at carefully.
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