MESS is an acronym that stands for Multiple Emulator Super System. MESS will more or less faithfully reproduce computer and console systems on a PC. MESS emulates the hardware of the systems and sometimes utilizes ROM images to load programs and games. Therefore, these systems are NOT simulations, but the actual emulations of the hardware.
Source
pleasantfiction.ipower.com/ps3linux/ps3bodega61/ppc/repodata/repoview/sdlmess-0-0129-1.ydl6.bdg.html
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