M1.XML 20120110 is released. M1.XML file for use with M1 - keeping up with changes in MAME. M1 plays the music from arcade games by running the code in the original ROMs (not supplied). This allows entirely authentic playback of classic video game tunes while you work.

M1.XML 20111205 Changelog:
1/10/2012 - 1914 Sets
Fixed:
strider2, pang3 - new parents
rainbow -> rbisland - setname change
bubsys (Bubble System BIOS) was still using the older pre-MAME romset.
Changed to match MAME current

Data Sync to MAME 0.144u5

Download: M1.XML 20120110
Source: Here