Remember that Windows didn't take off properly till Win95 - long after these boards were made. Everything before that used MS-DOS.
My A500 has a Vortex ATOnce with a 10MHz NEC V30 (8086 compatible). It's actually a nice little board, especially as it's a RAM and clock board too. EGA is very slow, though and VGA is mono, but it's great for old CGA stuff!
You could run Windows 2 on it I think, but I could be wrong....
