Hi mate are you having some fun with your Stealth Accelerator 
It's fun. Makes things zip along until you run into a game that refuses to work properly because of it lol. But then I have a switch that dissables it so no biggie.
So, by "natively," you mean PPC opcodes only running on a PPC system.
Yep, that's native.
68k opcodes running on a PPC? There's some level of emulation.
Now, as I've said, if it's done well, it doesn't matter what it's called.
It's very kual. I just think it's very kual emulation. ;-)
desiv
I suppose natively was the wrong wording. I perceived it that he was wanting to run things that seemed both hardware and OS agnostic. Kind of cross platform stuff. Kind of like how we have several languages that are cross platform.
However, like you stated, if he is wanting to run something that was intended for a 68k system on say x64 hardware then yes a layer of emulation would be be needed. Kind of like when Apple went from OS9 to OSX and they had that compatability layer which was a emulated version of OS9.