James Surine author of Mamed has updated his site with this news:

MAMED beta 4 is ready and available on the downloads page. It’s based on the fairly up to date mame37b15 source code base. The latest mame core removes 8-bit support so I probably will not update to that, because some games will run out of memory in 16-bit mode. The 68K cpu emulation should be fixed however some sound drivers still appear to not work, outzone for one. Be sure to turn off sound in those games or memory corruption could occur. Hopefully I can fix it next time around. There is a memory gauge built into the options menu so you can see how much memory is being used for certain games. Memory is very tight in some larger games, some will not even run if you use hyper’s menu and the pack must be run directly from kosh or boot.rc, outzone again is one of those. I modified hyper’s menu for the extra pack 16 & neomamed, the menu will also wrap now. You can also exit back to hyper’s menu from each pack, this cleans up any memory fragmentation that has occured while running a particular pack. There is also an option to hide clones which is nice to clean up the game list a little. Fake sound also works now. Many games that didn’t work before should work now. Also four controllers are supported the first one controls the menus, the buttons changed a bit because the joysticks are supported as true joysticks (with analog support) instead of mapping to the keyboard, you still don’t need a keyboard to play. Have fun.

To visit his site go HERE