I thought I would mention that my Sega Mega Drive / Genesis MIDI interface is now compatible with the Sega Nomad. Demo video here. As I often say with these sorts of updates, join the Gen/MDM Google Announcements Group to be notified of when this device will be available.
Finally, I’ve had a chance to add support for the SN76489 PSG chip in the Sega Mega Drive for my MIDI interface. The thing I love about the Mega Drive is the FM sound (which is why I’ve been concentrating on that), but of course everyone wants access to the PSG as well. The SN76489 support is basically a port from my Sega Master System MIDI interface, and includes many (but not all) of the latter’s functions and features.