I get what you're saying, but the obscure protection and lack of documentation when it comes to arcade hardware has really hurt the emulation scene quite badly.
I heard a little while ago that Primal Rage has some really crazy protections placed on its game rom. I don't think there is a properly working emulated version of it out and I don't think there will ever be. And do you think that old arcade manufacturers are purposely withholding information? Maybe so they can release a compilation or DLC of them on one of the new consoles?
I wouldn't be surprised if even Lockheed Martin has disposed of System 3 documentation, I know SEGA most probably has ;p
Be happy we're finally getting versions of Jambo! Safar for the DS and the Wii - although I miss the Arcade's control interface..:crying: