MESS was first released in 1998 and has been under constant development since. However, not all of the systems in MESS are functional some are marked as non-working or are in development. Īs of April 2015 MESS supported 994 unique systems with 2,106 total system variations. Its accuracy makes it also useful for homebrew game development. The project strives for accuracy and portability and therefore is not always the fastest emulator for any one particular system. MESS emulates portable and console gaming systems, computer platforms, and calculators. It used to be a standalone program (which has since been discontinued), but is now integrated into MAME (which is actively developed). Multi Emulator Super System ( MESS) is an emulator for various consoles and computer systems, based on the MAME core.