I recall a very old news article on amiga.org about someone that wrote a new PC emulator for the Amiga 68k, but it only emulated MS-DOS -- does anyone know what it was called, and whether it is on Aminet? I could not find it...
I do not think that it was DOSBox (I do not think it was an opensource project) - it was someone's individual attempt to emulate DOS from what I remember. It was not commercial either (PCx/PCTask).