I ran an offical version of MSDOS & Win 3.x using this on my A500.
http://www.amiga-hardware.com/showhardware.cgi?HARDID=346
Yep, I ran the same setup in college. My computer programming classes required a PC running MS-DOS. The ATonce worked pretty well although it was a bit slow.
The first version of Windows I owned was 95. I sold my A1200 for a 95 box. It was a sad day.