ice88 has released the source of the multi system emulator MESS for the DC, some of the systems that it can run are the Master System, NES, Atari 2600, ZX Spectum etc. & a whole bunch of other console & compter systems. So far ice88 has gotten builds of Lynx, Vectrex, Master System, Spectrum & the Amstrad to run, albeit slowly bar the Speccy version.
Full instructions on how to build it so specific systems can be used can be found in the ‘HowToBuildMessForDC.txt’ file in the MESS DC v0.71 zip, which can be downloaded from here. Most of us of course will be waiting for the likes of Reaper & perhaps BlackAura to do there magic & put out some releases, so you might want to check out this forum topic for more info on ice88’s port & maybe some future release news.