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[REL] NAOMI Multi-region BIOS

Posted: December 28th, 2014, 3:08 pm
by p1pkin
Merry Christmas and happy New Year!

Here is Christmas gift to community: modded Naomi/Naomi2 BIOS with region switching.
https://www.sendspace.com/file/11zffm

Use DIPSW 2-3 on filterboard to:

Code: Select all

DSW2   DSW3
OFF    OFF   Japan
ON     OFF   USA
OFF    ON    Export
ON     ON    Korea
both BIOS CRC-protection exploit and region changing logic was found/made by me personally.
shame *some persons* who uses results of someone else's free work commercially.

Re: [REL] NAOMI Multi-region BIOS

Posted: December 28th, 2014, 3:29 pm
by TylerDurden67
:thumbup:

Great work !

Re: [REL] NAOMI Multi-region BIOS

Posted: December 28th, 2014, 4:15 pm
by Braintrash
Thank you very much, sir! :awe:

Now, I can throw away my other BIOSes.

Question: what BIOS is it based on?

Re: [REL] NAOMI Multi-region BIOS

Posted: December 28th, 2014, 5:17 pm
by p1pkin
latest ones, rev C Naomi2 and rev H Naomi

Re: [REL] NAOMI Multi-region BIOS

Posted: December 28th, 2014, 5:20 pm
by purplec
Can you get one that will work with hotd2

Re: [REL] NAOMI Multi-region BIOS

Posted: December 28th, 2014, 5:31 pm
by Stompp
:clap: Great work and thank you for sharing!

Re: [REL] NAOMI Multi-region BIOS

Posted: December 28th, 2014, 6:09 pm
by cools
Great work, and thanks for sharing! This will work for my CF / NetDIMM setup?

Re: [REL] NAOMI Multi-region BIOS

Posted: December 28th, 2014, 6:17 pm
by Braintrash
p1pkin wrote:latest ones, rev C Naomi2 and rev H Naomi
Awesome. :awe:

Re: [REL] NAOMI Multi-region BIOS

Posted: December 28th, 2014, 7:03 pm
by p1pkin
cools wrote:This will work for my CF / NetDIMM setup?
I don't see reasons why it wouldn't work.

technically its vanilla Naomi 1/2 bioses with nice 1byte-patch. that means the code which reads DIP switches and changes region depending on it was already in bios, made by Sega, but not executed in normal circumstances. so there was needed to just enable this code.

Re: [REL] NAOMI Multi-region BIOS

Posted: December 28th, 2014, 8:53 pm
by andygeezer
Nice christmas spirit, mr V.

So i take it jeorg at arcademodbios is selling this?

Re: [REL] NAOMI Multi-region BIOS

Posted: December 28th, 2014, 9:44 pm
by RMRM
andygeezer wrote:Nice christmas spirit, mr V.

So i take it jeorg at arcademodbios is selling this?
Man, that guy is unbelievable...

Congratulations for your work p1pkin :D

Re: [REL] NAOMI Multi-region BIOS

Posted: December 28th, 2014, 10:44 pm
by Dache
Congrats for this, great work, and thanks for releasing it.

Re: [REL] NAOMI Multi-region BIOS

Posted: December 28th, 2014, 11:57 pm
by idc
andygeezer wrote:Nice christmas spirit, mr V.

So i take it jeorg at arcademodbios is selling this?
http://pornhub.com/gayporn/"

"updated 12/2014: NEW: SEGA NAOMI 1 and 2 Modbios 1.11 (JPN/USA/EUR/KOR - DIP Switch 3/4), MULTIBIOS!"

When I saw that on his site a couple of weeks ago, I initially thought that Joerg had done the work. Given his track record, I guess I should have suspected otherwise right then. He is to modding/hacking what Stv is to YAJ.

What a ****.

Great work p1pkin, and thanks for sharing! Credit where it's due. 8-)

Re: [REL] NAOMI Multi-region BIOS

Posted: December 29th, 2014, 7:55 am
by mastercello
:awe: :thumbup: Excellent work and thanks a lot for sharing!

Re: [REL] NAOMI Multi-region BIOS

Posted: December 29th, 2014, 9:15 am
by cools
Awesome :) need to nag someone with a programmer now, I've got two motherboards to mod ;)

Re: [REL] NAOMI Multi-region BIOS

Posted: December 29th, 2014, 11:14 am
by andygeezer
cools wrote:Awesome :) need to nag someone with a programmer now, I've got two motherboards to mod ;)
I got a programmer if you need help.

Re: [REL] NAOMI Multi-region BIOS

Posted: December 29th, 2014, 12:52 pm
by p1pkin
andygeezer wrote:Nice christmas spirit, mr V.

So i take it jeorg at arcademodbios is selling this?
Thanks.

Probably almost this. As I see they uses DSW 3-4, that means they didn't find original region switching code which uses 2-4, so injected own code to do this.
idc wrote:When I saw that on his site a couple of weeks ago, I initially thought that Joerg had done the work. Given his track record, I guess I should have suspected otherwise right then. He is to modding/hacking what Stv is to YAJ.
What a ****.
I don't want to go deep into tech details, so I'll try to explain shortly -
in the term of BIOS modding, the main problem with HOLLY-chipset based systems (Naomi, Dreamcast, and others) is hardware checksum protection, which algorithm is still unknown btw.
so during all ~15 years life of DC-based hardware was unable to add/change code we want, except few lucky cases, when modded bioses passed check by the luck, because of CRC algo weakness.

it was so until this happened - http://forum.emu-russia.net/viewtopic.p ... 024#p23024"

does 'arcademodbios' guy(s) hacked/bypassed this security by yourself ? - I don't think so. I doubt they know how it works or even exists (the security checking/unlocking is well obfuscated, so if you don't know it is there - most likely you'll not notice anything at all ;) )

so, in my opinion sell things, which is almost entirely consist of someone else's work, even without giving credits - is a total [insert bad word(s) here]

Re: [REL] NAOMI Multi-region BIOS

Posted: December 29th, 2014, 1:29 pm
by jodre
Thx, such a nice christmaspresent.
Only tried out a few games on Naomi2 and JP/EXP but seems to work flawless so far.
No problem netbooting either btw if that question wasn't confirmed

Re: [REL] NAOMI Multi-region BIOS

Posted: December 29th, 2014, 4:34 pm
by Tyranix95
Awesome! :awe:

Anybody check for HOTD2 compatibility, yet.

Gonna presume it that's the next step.

Re: [REL] NAOMI Multi-region BIOS

Posted: December 31st, 2014, 5:06 pm
by LemonyVengeance
Excellent work! Thank you so much for this :D