I already did.. one for the ND-100, and one for the ND-500(0). But they are not done yet, and not release ready. The ND-100 emulator can't run the operating system, it only executes ND-100 executables under *nix. And it can't run multi-segment programs like Notis WP. The ND-500 emulator doesn't have to worry about operating systems, but my emulator isn't complete because there are still a couple of undocumented corners I haven't figured out yet. But I can run compilers and tools on both of them. My Nokia N900 phone has been running the ND-100 emulator for a very long time.. PED editor, Fortran-77 compiler..

But not release ready still. I'm busy working on the FUSE filesystem implementation at the moment.

There's another very good ND-100 emulator out there (runs executables like mine), it's on Github.