definitely has 4bpp tiles, maybe even 8bpp on these models (that alone could be why EmuVT can't run them?)
I've heard nothing but crappy looped samples for sound, so might just be some DAC or crap sample playback hardware.
some of the more recent ones look like they might add more scrolling layers.
the thing I own (which I'm guessing is some version of the same tech) also has a bunch of NES games on it, so it is somewhat backwards compatible too.https://www.youtube.com/watch?v=IWLdOoJ-4xg
also, is it still true that only EmuVT, a closed source hack of Nester, runs any of these? with all the NES emus out there nobody else has bothered? or is that info out of date.