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In File "sfiii3_japan_nocd.29f400.u2" Change $1FECB From $60 To $65

In file "sz3e.03c" The region is located at offset $101E-$101F. Unencrypted Rom: Change $101E From $0A To $02 Encrypted Rom: Change $101E-$101F From $BE83 To $80B9

The .keyfile does include more than the master key. Mame decodes the data before it's used for decryption. If you want to see how the data looks decoded you can do the following from a command promt: mame -cc (create mame.ini) Open mame.ini with a text editor and change "log 0" to "log 1"...

Mame are not using hardcoded master keys anymore. From Mame 0.178 (Released 2016) did they start to use a 20 bytes ".key" file instead that can be programmed onto a CPS2 motherboard. It's possible to extract the 64 bit master key and the watchdog instruction from the file but not really needed...

How About This? Don't do any of the patches above, change only $70BC from $03 to $01 in rom "021-p1.p1"

In file "001-p1.p1", Change from $67 to $60 at adress $2ba3 :thumbup:

BTW: Why do you want to change region to Japanese? Are there any significant differences between the regions except for the highscore entry?

There are three sets in Mame. Two of them change does let you change region between US and Europe, via the Jumpers, The Williams Licence set can't be changed to Japan region. You need the set called "Zerowing1 (Zero Wing 1 Player version) in Mame to be able to change region to Japan. Only the...

You can also verify the pcb sticker (841-0017B) with the part number for the game cart, in Mame's Naomi driver... "Mobile Suit Gundam: Federation Vs. Zeon - 841-0017C" "Power Stone 2 - 841-0008C" (The letter that follows the part number) A = for the Naomi mainboard B = for the PCB C = for the...

IF you don't find any seller for this chip. Check with @caius about his Toaplan 'GXC-0x replacement. I think that one will work with Zero Wing too.

In Mame the selected character is colored, the rest of the characters are black & white. Not same on the pcb hardware?

The game is quite rare so finding schematics will be hard, If they even exists... But there is an Operators Manual available.

I have something that might help you. Check the PM I sent you...

No, because, there are different eprom configurations and two kind of Sims, So how the data is arranged in the sims will depend on the game.

I thougt at first it was a joke, but now I realize this must be the coolest cabinet conversation ever. Rock on!:thumbup:

Most of the Capcom CPS2 games contains all the regions and languages, with them you can select the region by change one byte in Rom 03. But there are some exceptions that use diffent roms and with them it's better to change all the needed roms, since they do differ more than just the region byte...

Yes, a hack, not an official Capcom release: https://www.patreon.com/posts/65695449 https://github.com/originalgrego/ssf2xjtb

A test of an encrypted version of "Super Street Fighter II X Tournament Battle". Because It's not possible to test if the encryption watchdog work or not in Mame. But it's no stress. I still have something else that keeps me busy. :P

Does your board still runs on battery/encrypted code? If it does I have something you could help me to test, some time...

Regarding reading rom 1/2. You can check the Raiden 2 Driver in Mame. "Later boards 1 - 27C402 or 27C4096 EPROM labelled 'SEIBU 1' at location U0211 (DIP40) 2 - 27C402 or 27C4096 EPROM labelled 'SEIBU 2' at location U0212 (DIP40)"