A new version of  this great emulator, based on blueMSX  and conceived for Mac OS X version 10.6 (Snow Leopard) and higher,  is available !

What’s new ?
- added option to enable/disable status bar (now off by default)
- added limited gameplay capture and recording
- added mixer configuration options - control volume and balance of all six channels (PSG, SCC, MSX-Music, MSX-Audio, Moonsound, Keyboard)
- added ability to paste text into the MSX computer (by simulating keystrokes)
- removed black bars on the sides of the emulator window
- improved mouse support (press Cmd+Click to disengage mouse mode), as well as new mouse configuration options
- improved machine selector - now on a separate tab in Preferences : you can download, install and uninstall machines automatically. Special thanks to the blueMSX team for providing server hosting
- improvements to the keyboard editor, including automatic layout detection and more intelligent key editing
- lots of bug fixes

http://www.cocoamsx.com/

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