Here's the section for the wikipedia article you mentioned in your comment:
Bleemcast! is an independently developed commercial emulator by Bleem! that allows one to load and play PlayStation discs on the Sega Dreamcast. It is compatible with most Dreamcast controllers and steering wheels, and leverages the Dreamcast's superior processing power for enhanced graphics. It was created by using the MIL-CD security hole found in the Dreamcast BIOS.