mrfresh wrote:
how can I know what is the latest OS I can run on this machine?
If you've checked the ROMs and they're labelled 40.xx then you're using V3.1 as you've guessed. Yes the user interface is a little on the "clunky" side, but there are several tools to give it a facelift.
There were two subsequent OS releases, 3.5 in 1999 and 3.9 in 2000. Both need 3.1 ROMs to work and will run on any Amiga provided there's adequate expanded (Fast) RAM and a CR ROM drive. I think you'll need somewhere in the region of 6MB to run either of these OS's.
OS4.0 is PPC only and will be released "when it's ready".
:-D