In my case, everything worked well with One must fall (music, speed, etc.)
until the fight with Jack in the first tournament. Now, I keep being completely booted out of the game back to windows everytime, just as I am about to win! It's very annoying!

Addmitedly, I'm new to Dosbox, OMF being the second game I installed with it, (the other being Fantasy General, who works fine so far) so it my be a something I do wrong, and not Dosbox's or the game's fault.

I'd be grateful for any pointers, if it's a problem I can actually solve, otherwise, this is at least a warning for others not to get their hopes up of actually finishing the game...