Heliophobe author of Smeg posted this in our forums:

Next Smeg will have limited VCS emulation.
I took a week and a few days off from working Smeg and started a VCS emulator (after having studied VCS hardware and programming manuals for a while before that).And it runs with sound, and plays a number of games, but doesn’t play any game quite correctly -this was due to me not realizing that nearly every VCS game depends on being able to do mid-raster updates, which I have no support for currently (other than for sprite positioning).I’ll have to rewrite my graphics routines from scratch as well as many of my memory handlers. But I figure I’ll sneak it in a future release of Smeg so that people can try it out without wasting a whole disc on it (just stick the VCS roms in their own directory and forget about them if you don’t want to play around with it anymore).

To read the rest in this very interesting topic in the classic forum click HERE