> This reminds me of Raiden II and long termed "impossible to emulate" situation.
Except while Raiden II has gradually been made playable due to Kale's hard work, I don't think anyone knows with 100% certainty whether the Seibu COP emulation is 100% correct or not. There could be any number of subtle issues in rarely-used code paths. The worst thing is that by all accounts, the Seibu COP isn't a microcontroller and doesn't appear to have internal ROM, it's just a huge gate array which could be doing basically anything.
It's a testament to Kale's tenacity and intelligence that Raiden II is as playable as it is, but short of someone doing comprehensive trojaning of the results that the Seibu COP sends back for various commands, I think the "impossible" label for Raiden II and associated games is still rather apt.
To be honest, I would consider the new DS5002FP dumping effort to be in the same realm of not-quite-100% as Seibu COP, since I seem to recall Haze pointing out that none of these games do any checksums on the contents of the DS5002FP's RAM - so the only way to determine whether the dump is good or not is to simply try it in MAME and see whether or not it fails to work correctly. Then there's the additional layer of uncertainty of whether or not any misbehavior might be due to inaccuracies in MAME's 8051 core, as opposed to inaccuracies in the dumps.
Nonetheless, it's still an absolutely amazing accomplishment, and both Peter and Morten deserve all of our congratulations. But make no mistake, this is hardly the final chapter in this particular story. Rather than closing the book, it opens new doors to explore.
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