From mamedev.org:
The highly-anticipated release of MAME 0.245 has finally arrived! As I’m sure many of you are already aware, we’ve added support for two elusive arcade games that didn’t see widespread release: Megumi Rescue and Marble Madness II, and the Konami Polygonet system has finally come to life. But before we get to that, there are some changes to MAME’s user interface that you should be aware of. Input options have been moved off the main menu to a submenu of their own. Depending on the system, there can be quite a few of them, and they weren’t all grouped. There’s also a new option to see the input devices recognised by MAME, which should help with diagnosing issues.
Continue reading at https://www.mamedev.org/?p=514 and/or get the Mac downloads here: