Quote Originally Posted by burns flipper View Post
http://classicwb.abime.net/classicweb/multiboot.htm
That's more like dual startup-sequences than dual booting, loading different setups on the same partition and Workbench, but you could do something similar to boot two operating systems I would have thought.

You'd put 3.1 on the first partition and 3.5/3.9 on the second. Then setup a boot menu (or mouse button boot program like I did in the ClassicWB packs) in the original startup-sequence that goes on and executes other scripts.

It's not perfect however, as you'll have to have loads of assigns for things like C, S, ENV: etc. pointing to the second partition. Perhaps there are other complications; I don't know as I've never tried.

Must be a partition boot loader on Aminet, or you can just use the early startup menu to choose a partition as others have mentioned above.