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just for the record - CPS3 had no any "special versions" for different regions, they released only one game binaries for all of them. but, it may behave different depending on country/region byte from cart firmware. I don't believe there may be some "special AI" for some country, well, because...

@msamiullah I'd guess it was typo in Darksoft's message, dumped BIOS actually Asia NCD, and I've added it to MAME as such.

@msamiullah Asia CD is something unusual for CPS-III, so far we have dumped Asia CD BIOS from only one game - Jojo's Venture

well, not many of Naomi games supports cab linking, so, perhaps it's really power issue but only CVS2 was tested? it's also might be both hardware and software issue. example scenario - some of JVS data packets may be treansfered bad due to power issue, some games is OK with this and do another...

that, and JVS test screen photo from Naomi BIOS

did I get it right: it works ok with Sega Jamma I/Os like 838-13683 but have issues with Sega Type-1 (837-13551) ? it looks quite weird, because these I/Os quite similar at hardware and software level...

is it known if this problem happen with Capcom JVS I/Os, or the problem is Sega JVS specific?

you may find out version/revision of CPS3 games from CD ring code, and that's the only visual way iirc.

not sure if I've seen this kind of things in blog posts. back in the days M2/M3 cracks/patches was documented in MAME and Supermodel emulators source code. when protection chips was emulated patches was removed too. anyone interested who is not totally braindead was able to apply those patches...

I'm not sure, but I may suggest it wasn't yet dumped at the moment when some smart person (Elsemi?) did all these M2/3 cracks. is it still not cracked? or it's cracked but not available for free? ;) btw, is there a list of protected Model 2/3 games which is still not cracked at all? very few...

99% of protected Model 2 or Model 3 games have no any encrypted game data, and DOA is not exception. because Sega used protection chip in the most dumb stupid of all the possible ways - push to it a bit of encrypted data, read decrypted data and then compare with some hardcoded values or text...

yeah, at least socketed EPROMs, which should not be a big deal.

you'll get this error if anything wrong in the chain: 315-6146 I/O MCU -> ADM485 IC80 -> CN2 connector -> filter board -> JVS connector -> cable -> JVS I/O board. in 1st place worth try to replace JVS I/O and its cable, if it doesn't solve the problem worth to check if JVS connector at filter...

it smells like VDP1 has been died, or something wrong with its connection to SCU chip, so, all the 3 RAM chips connected through it doesn't pass RAM test. not sure which exactly chip it is on ST-V, it might be 315-5689 or 315-5883

out of curiosity, what is the differences with regular BIOS, only region code byte or more?

CPS3 store settings and unlocks in 93C46 EEPROM, perhaps it's just previous PCB owner already entered Akuma unlock code? :unsure:

are you sure it's true for SFIII 2nd? which by design use not encrypted game program SIMMs = no need to modify them = checksum should be OK

false what exactly? yes, I'm aware of CF vendor check is in firmware.asic

you've been already told - firmware programmed inside of ASIC (NEC V850 CPU with flash), and there is no known ways to manually reprogram it. for sure there should be the way to (re)program it, for case when new PCB was manufactured at factory and ASIC have no any firmware yet. but, it's...

@telmnstr media board firmware is inside of large Sega ASIC, there is no known to me way somehow manually reprogram it. TSOP flash ROM iirc is segaboot. that's the code which shows you test mode screens, and it's fine if you see them.