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Efforts to port MESS to JavaScript
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bios Starting to make the Makefile more modular for future expansion. Stil… Sep 29, 2012
helpers Tweak some inconveniences in genhelpers scripts May 7, 2015
systems Re-adding a new JSMESS systems location Dec 21, 2013
templates Fixed issue with losing scale on exiting fullscreen Oct 26, 2014
third_party Update third_party May 7, 2015
.gitignore More granular -listxml grepping for e.g. abc80 Dec 23, 2013
LICENSE Update LICENSE Nov 18, 2014

The JSMESS project has been integrated into the upstream MAME repository at and this repository is now defunct. Follow the instructions at to do an Emscripten compile with unmodified MAME source.

Below is the out-of-date original README.


JSMESS is an attempt to port MESS / MAME to JavaScript using Emscripten.


Jason Scott says it best:

The MESS program can emulate (or begin to emulate) a majority of home computers, and continues to be improved frequently. By porting this program into the standardized and cross-platform Javascript language, it will be possible to turn computer history and experience into the same embeddable object as movies, documents, and audio enjoy.

Status of JSMESS

Jason Scott's JSMESS site has demos for most working systems now. JSMESS is now tracking the latest versions of MESS, and sound and joystick support work in many cases.

Building 0.153+

To build JSMESS 0.153+, start with How to build and test JSMESS 0.153.

Relevant Links

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