For tracking MAME / MESS bleeding edge progress it’s a surprisingly unknown fact that there are public mirrors of the private SVN, hosted by the MESS guys.
This means that the latest MAME /MESS source snapshots can always be downloaded at
Note, this is quite demanding on the server, so it might take a while to respond and give you the download, especially for MESS which needlessly has a lot of artwork in the package bumping it to 60mb in size. Obviously if you can set up a GIT client, and sync manually, rather than downloading the complete package every time it will be a lot quicker and less demanding, if anybody has a guide to this on Windows I can publish it.
For MESS the normal SVN is of course already public read at
so the GIT mirror isn’t strictly necessary, and an SVN client is much easier to install and use on Windows (just use TortoiseSVN it’s near enough plug-and-play unlike the GIT counterpart)