Pate has posted some more wip news of his Dos emulator for DS:
Last weekend I didn't have quite as much free time to work on DSx86 as I normally have on the weekends. The little time I had was spent continuing work on the internal DOS emulation. I got some of the 4DOS internal commands to work (like "memory" and "beep" :-), and finally on Sunday I got "dir" command mostly working. That needed an interface and conversion between libFAT internal structures and DOS internal structures, but I managed to get this to work and show also file dates and sizes correctly. So far this works only on the top level directory (as I don't yet have current working directory handling). Next I'll try to get launching a program from the root directory to work.