From: Al <[EMAIL PROTECTED]>

I've noticed that some iMacs came preinstalled with both OS9 and OS10.

Not any more they don't. You're looking at older machines.

Having said that, OS 9 can be installed on most any modern Mac and will run as "Classic" -- sort of 9-within-10 for backward compatibility. Works great!

 On
the surface that seems to be a major advantage in that you can run
applications specific to each OS.

I'm not aware of much of anything that's still relevant that doesn't run in Classic. I'm sure there are a few specialty apps out there but I'm talking about for mainstream computing ... can't think of anything.


 Am I correct in thinking that there is an
advantage here? Also - how does that work? Do you boot up in one of the
operating systems before using the OS-Specific applications?

Well, we're talking about two different things:
1. Running Classic, which allows you to run OS 9-compatible programs in OS X, *OR*
2. If your machine is capable, you can boot up in OS 9 and ignore OS X and vice versa.


Apple continued to sell "OS 9 bootable" machines (a couple of models) for quite some time, but have stopped doing so now. All those machines (including the new ones) can run "Classic," which 95% of people who thought they'd never leave OS 9 find themselves barely using after the first six months. OS X is a surprisingly robust and mature OS for something that's less than four years old -- let's just say that the original Mac OS was far less developed on ITS fourth birthday!

Bottom line: you can run OS 9 apps in OS X through the engineering magic of Classic, and while not 100% compatible with every conceivable old program, it seems pretty solid for almost every OS 9 app under the sun. I still run a couple of beloved old games, Quark 4 (sometimes), Quark 5 (more often), and Photoshop 4 (got lots of old cool plugins, including one for a scanner I haven't replaced yet) in Classic and it all works flawlessly -- better, in fact, than they ever did in OS 9!

_Chas_

"If you want to encourage your kids to color outside the lines, think creatively and zig when the other kids zag, get the Mac. On the other hand, if you want to teach your kid that life is full of frustration and that anything worth getting takes plenty of patience and hard work, a Windows machine should do quite nicely."
-- D. Plotnikoff



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