on my a500 i used 3.1(bought ks, and used os files off cd32 disks) until 1999 when i bought a crappy compaq the salesman made me think was decent.
bought unreal at the same time and it ran like molasses. in 2001 i bought a good pc(ran anything i threw at it).
i also used 1.2 1.3 2.1
recently i aquired an a1200 with 3.0 on it.