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Install Previous Versions of OS X on a new mac
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Mac Enthusiast
Join Date: May 2001
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Previously I know that it was not possible to install an OSX version that is older than what a machine shipped with. Is this still the case?
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Mac Pro 8x2.8 | Macbook 2.13 | Saab Trionic 7 (thats right, runs on a 68k!)
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Clinically Insane
Join Date: Dec 2000
Location: Caught in a web of deceit.
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Originally Posted by gto47 
Previously I know that it was not possible to install an OSX version that is older than what a machine shipped with. Is this still the case?
Yes it is.
I've done it before though, and it's sometimes worked, but even if it did work I'd run into weird glitches.
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Mac Enthusiast
Join Date: May 2001
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Yeah, there is a thread on the apple discussion boards about all of the weird bugs that doing this causes. I wonder if installing to a drive through target disk mode has better results. This is a pretty painful problem when trying to set up a QA environment for testing.
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Mac Pro 8x2.8 | Macbook 2.13 | Saab Trionic 7 (thats right, runs on a 68k!)
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Moderator  Join Date: Oct 2001
Location: San Jose, CA
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Maybe you can explain why you need to run an older version of the OS.
Steve
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Celebrating 10 years and 4000 posts on MacNN!
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Mac Enthusiast
Join Date: May 2001
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Primarily for QA testing on previous versions of Safari.
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Mac Pro 8x2.8 | Macbook 2.13 | Saab Trionic 7 (thats right, runs on a 68k!)
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Clinically Insane
Join Date: Dec 2000
Location: Caught in a web of deceit.
Status:
Offline
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Originally Posted by gto47
Yeah, there is a thread on the apple discussion boards about all of the weird bugs that doing this causes. I wonder if installing to a drive through target disk mode has better results. This is a pretty painful problem when trying to set up a QA environment for testing.
Target mode is the way I've installed it. I don't know if a regular clean install method would even work.
For example, when I tried to install an older version of OS X on an iMac, it worked fine... except the iMac's fans were on full blast all the time. I presume it was because the older version of OS X didn't know how to interact with the new unrecognized fan controller.
And to flip things around: I have installed newer versions of OS X on very old hardware that wasn't supported. In that context I'd get glitches too. For example, I ran 10.5 Leopard on an 800 MHz iMac. Sometimes after sleep I'd get weird video artifacts. Presumably it's because no Leopard supported machine actually contains a GeForce 2 MX so there's no bug-testing that was done for that model GPU.
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Moderator Join Date: Apr 2000
Location: Gothenburg, Sweden
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Originally Posted by gto47
Primarily for QA testing on previous versions of Safari.
Then consider using virtualization software. Parallels is probably the best desktop solution right now, while VirtualBox is free.
Licensing for previous versions of OS X generally requires you to have a server version of the OS to virtualize. This requirement was removed in Lion, but I have not heard that the change was retroactive. Some virtualization software will enforce this rule - YMMV. I suggest you download VirtualBox and give it a spin.
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The low-end Mac Pro is the most overpriced Mac since the IIvx
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