Sid Meier's Colonisation, my 10 year old laptop that I replaced last year only had enough power to play that game and I put so many hours into it when I didn't have access to my main pc. It's just a shame that my new laptop doesn't upscale dosbox the same way my old one did but I think that's just because of the differences between MacOS and Windows.
(Edit: wrote the wrong game series somehow)