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"Crack the SEGA Saturn copy protection" contest
Mr. Saturn - Feb 26, 2005

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  SAG26 Mar 13, 2005

  
	
	

		
		

			Originally posted by croft@Sun, 2005-03-13 @ 12:11 PM



Hi Curtis,



Good point.



The security ring is a major hrdle for sending games out to people.



On a different note I am thinking of trying to get a normal saturn disk - cut the centre part out - then attach it to a cdr which has also been cut but still has the boot code on it.



I would guess that this has already been discussed on the forum etc.



It amazes me how this machine still has major hardware security after all this time?



Like others have said'the boot cd code must be exploited and permanently installed into the bios chip.



I guess this is essentially what the chips on the market are doing?



Will let you know findings from cut disks.




[post=131402]Quoted post[/post]


I was actually thinking about trying this myself. If you get around to it before I do tell me if it works or not.

 RockinB Mar 13, 2005

  
	
	

		
		

			Originally posted by Mask of Destiny@Sun, 2005-03-13 @ 06:09 PM



If someone has a dump of the ROM on the thing, I could take a look at it in the good old disassembler.




[post=131404]Quoted post[/post]


Cyber Warrior X dumped it:

mpgromdump.zip...

 Borisz Mar 13, 2005

  
	
	

		
		

			Originally posted by AntiPasta@Sun, 2005-03-13 @ 07:11 AM



I'm sorry but I disagree - the VCD card mainly served to play VCD's, and NOT as an addon for games.




[post=131392]Quoted post[/post]


The sega dev manuals clearly say that when the VCD card is installed, the Saturn can mux the VCD stream onto the output picture in several ways, even with transparency, or move it around as a texture (like how some of the Sega Flash demo discs did with regular CPK streams, they were pasted on monitors on a huge ratotating 3d complex iirc).

So basically, yes, it was an addon too. A pity that so few games used it.

 mal Mar 14, 2005

  
	
	

		
		

			Originally posted by croft+Sun, 2005-03-13 @ 10:41 PM-->
QUOTE(croft @ Sun, 2005-03-13 @ 10:41 PM)
Hi Mal,



Both Sega blanks are sealed and brand new.



They do have the security ring on them and the rest is blank.




[post=131390]Quoted post[/post]


[/b]



If they're both sealed, how can you be sure that they have the security ring on them?

QUOTE(retro @ Mon, 2005-03-14 @ 04:49 PM)
Why copy that? It is ONLY a boot CD - much like say the dreamcast boot CD. Your CD-Rs won't boot without it (well, there's swap trick or mod chip).[/b]



From what I understand (and Imay be mistaken, I don't have a Saturn), under normal situations the SH-1 resets it's internal CD authentication status whenever the CD door is opened so in order to successfully do a disc swap one must trick the Saturn into thinking the door was never opened. This boot CD seems to get around that somehow. This alone doesn't allow us to achieve that holy grail of a self-booting CD-R on a Saturn (short of a mod-chip that is), but it could be useful in conjunction with some exploitable flaw (which may or may not exist) somehwere .


  
	
	

		
		

			Originally posted by retro@



Saturn CD-Rs do NOT have an outer ring, AFAIK.


I have seen pictures of CD-Rs with an outer ring. Of course, they could have been fakes and even if they're not fakes they might be made by the pirates and not by Sega for developers.