Hi- I use 8.6 in my Duo and it works well. Have tried 9.0/9.1 but they slow it down too much. Remember my Duo is only a 280c with 40MB ram. Yours has more ram. You don't want 9.2.2. That's for Classic in OS-10. You'll want no higher than OS-9.2.1 On Dec 18, 2005, at 2:45 PM, Joseph Fisher wrote: > Hello, > > Joe Fisher, a new 2400 user here again - > > Which OS gives the 2400 the best speed & performance? (ie when does > the OS upgrade factor begin showing the limits of even a fully > upgraded machine or what OS upgrades result in the need for Houdini > style tactics to load on a 2400 etc.) > > The 2400 I recently purchased has 8.1 loaded on it. > > I own CDs for 8.5 & 9.2.2 (as well as OS X all vers. but I don't > want to load OS X) I've read 9.1 is the highest OS that can be > loaded. Currently it's selling for about $19-25 on e-bay > > I have plenty of "Classic" software which will do me fine - As > mentioned in prior posting - This machine will eventually get a > 240MHz daughter card & the 80 MB RAM treatment. BUT I want it to > remain quick and nimble as a commuting machine for travel as well > as home/office commute. > _______________________________________________ > DuoList mailing list > DuoList at listserver.themacintoshguy.com > http://listserver.themacintoshguy.com/mailman/listinfo/duolist > > Listmom is trying to clean out his closets! Vintage Mac and random > stuff: > http://search.ebay.com/_W0QQsassZmacguy1984 Jim Allen