Make it possible to run from discs
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As we support PSX games through a free BIOS, we should make it possible to use real discs to play the games, even if we require to "rip" those discs first, such as done there: http://www.pandorawiki.org/Creating_images_of_PSX_games_using_Linux
We could presenting this as installing the game rather than ripping the disc.
We culd also do it for Mega-CD and PC-Engine CD-ROM².