Adding items to software lists is a good start if you'd like to contribute to MAME. It doesn't even require compiling: * download the source * open the relevant xml file found in the hash directory (in this case megadriv.xml) in a text editor * spend a few minutes looking at it to understand if entries are listed in a particular way (i.e. alphabetical order, year order, particular groupings like official titles, bootlegs, prototypes, etc. This may vary from softlist to softlist) * add the entry, respecting the layout of the file, and save * launch MAME to test it * if it works and MAME doesn't report any errors, you're ready to commit the change * before committing it's always a good idea to run mame -validate and, possibly, srcclean the file (srcclean is a tool which is distributed with every MAME release, usage i.e. srcclean hash\megadriv.xml)
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