A new update to MAME 0.121 has been posted. With this update we now have support for a number of new and rare Namco System 12 games (not all working), some nice new SCSP updates, improved Star Wars accuracy, and a mostly working Mortal Kombat 4. We're nearing the end of the 0.122 development cycle, so be sure to report any significant bugs over at MAMETesters. Thanks!