right, GDT-0011 dump from MAME had bad sectors. speaking in general, I'd say it is enough to dump data tracks once and check them using "EccEdc" or similar tool, if there will be no errors - I see no good reason to redump these tracks. only audio tracks should be dumped several times to ma...

does this disc had GDS-0026A label ? while GDS-0026B ring code and contents.

technically, this is a part of Virtua Fighter 4 Evolution (GDS-0024) kit, because this game require DIMM board firmware to be 2.17 (or later), also uses same security key. same with v2.13 update GDS-0023A and Virtua Fighter 4 (GDS-0012), or v3.17 update GDS-0023E and Virtua Fighter 4 Final Tuned (GD...

update on this, but not optimistic one. finally I get to the point where game wants key, it is about 4-5 hours of gameplay, until upper Valua city rail train scene. game looking for E.ARCADIAKEY at VMUs, quite small - 1024 bytes (2 blocks), its contents: VMS header + one icon followed by actual &quo...

I'm not greatest expert in encryption, but it looks like key file might be brute forced, but I'm not sure how complex math it is and how much compute power it takes.

to my big surprise, Arcadia @barai turned out pretty amusing case. this game looking for E.ARCADIAKEY file at VMU, if it was found it will be used as decryption key for USR.PUB file located at game disk. decrypted data in its turn becomes another decryption key, for ~150 FIELD/*.MLE files. pretty ni...

the plan is to run game in emulator with debugger, plus disassemble and analyze code in IDA, usual reverse engineering stuff. but I don't have enough time (and TBH no desire too) to play game dozen(s) of hours until the point where "key" is needed. so, it will be nice to have some input da...

majorpbx wrote: ↑Tue May 01, 2018 6:57 pm do you know if anyone anywhere has a save with the key file needed for this or the Eternal Arcadia game?

I think I can look at that.
is it known at what point these games require "key files" ? it will be perfect to have game save files near that point.

v1.004, v1.01d and v1.022 represent the only all BIOS versions for retail Dreamcast (including US/JP/PAL models) ? correct. with small addition - v1.004 is JP only (at that moment there was no US/EU models yet) and boot Japan region only discs (it have no code which change region based on Flash ROM...

true here is more photos from owner/dumper https://picasaweb.google.com/101985214970836533590/SegaDreamcastDE94002719802?noredirect=1 on picture below is most likely manufacture month/year https://picasaweb.google.com/101985214970836533590/SegaDreamcastDE94002719802?noredirect=1#5989507405109553314 ...

can I see the list and CRCs of dumped but but not yet verified Naomi 1/2 GD-ROM dumps ?
there must be at least "Tetris Kiwamemichi (GDL-0020)" mentioned in 1st message.
thanks.