You are not allowed to distribute a modified version, nor to remove and/or add files to the archive. In addition to the MESS Licence, The MESS Team required that: 'MESS must be distributed only in the original archives.

The license is similar to other copyleft licenses in requiring that rights and obligations provided in the license must be remain intact when MESS or derivative works are distributed.

MESS was distributed under the MAME Licence, which allowed for the redistribution of binary files and source code, either modified or unmodified, but disallowed selling MESS or using it commercially. On May 27, 2015, MESS was formally integrated with MAME and became a part of MAME. MAMEDEV member David Haywood maintained and distributed UME (Universal Machine Emulator) which combined much of the functionality of MAME and MESS in a single application. MAME and MESS were once separate applications, but were later developed and released together from a single source repository. 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.

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