That is all I need.Up to SNES. PS1 emu will lag and N64 crawl. If there are any.
http://gbatemp.net/threads/n64-emulation-on-3ds-speculation.340581/page-5#post-4508679
This GCW Zero device undoubtedly has the spec to provide nice PS1 and possibly N64 emulation though.
My key concern is that it uses a MIPS processor though. A number of similar open source devices like the Dingoo A320 and the GP2X Caanoo to my knowledge have used ARM processors.
I do not know if you can simply port over code made for ARM devices to a MIPS device that easily.
Youtube videos of the GCW Zero in action however, have shown it emulating Shantae for Gameboy Color at full speed.
The DS running Lameboy was not capable of that, and my GP2X Caanoo could only play it near full speed.