Bleemcast!
From Sega Retro
Bleemcast! is a independantly developed commercial emulator by Bleem! for use with the Sega Dreamcast. Taking advantage of loopholes within the MIL-CD format, Bleemcast! software allows the user to play Sony PlayStation 1 games through their Dreamcast, often with enhanced graphics.
Bleem!'s plans for the Bleemcast! were very optimistic at first. The aim was to allow any PlayStation game to be run on Dreamcast hardware, but thanks to technical difficulties this was reduced to just three "Bleempaks" - boot discs for Gran Turismo 2, Tekken 3, and Metal Gear Solid. A prototype version of the software has since been leaked, showing that the technology was capable of running many more PS1 games.
While running under Bleemcast!, PS1 games would adopt anti-aliasing and bilinear filtering and run in a 640x480 resolution (as opposed to the PS1's 320x240). Bleem! had planned to release special branded controllers due to the Dreamcast having less buttons, but this plan was cancelled too. All Bleem games need a dedicated VMU for saving.
Sony took Bleem! to court over the Bleemcast! accessory, and although they didn't manage to block the product, court costs left Bleem! without much cash and the company was shut down in November of 2001.