http://trondsemu.byethost15.com/
First version of TronDS a Nintendo 3DS Emulator, It's very simple and is only
capable of running homebrews. It currently supports:
‧ARM9/ARM11 interpreter for the 3DS appcore – the processor core dedicated
to running user applications
‧OS HLE to support userland interaction with the various 3DS OS services
‧Framebuffer rendering
‧Debugger with ARM11 disassembler, register view (written in C#)

3DS的emu大概还有一大段路要走?

只是模拟3DS自制程式的软件而已。