Is it against the EULA to install Mac OS X 10.0 on Mac OS X 10.11?

Your question is too narrow.

Tell us what you are trying to accomplish.

It is still not clear.

Good luck finding a virtual machine app that will both work on El Capitan and install an old version of OSX.

I do not understand about how purchasing two Macs will help.

This may help:

Can I run Classic thru a virtual machine in Yosemite?

If you have access to a legitimate Installer for 10.10, you can simply install it on a spare drive. You do not need a Hypervisor to muck it up.

The Mac will boot and run from any drive, internal or external. Under Mac OS X, the Internal drive is not magical.

If you do not already own Installers for 10.9 and 10.10 they are no longer available for sale as new.

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Surely you have something better to do with your time then investigate obsolete versions of Mac OS X.

I think you should buy a Beige G3 and then you could run system 9 on it. That was a really good one.

Or buy a Mac-II and run System 4.2 with MultiFinder off diskettes.

Grant Bennet-Alder wrote:

Surely you have something better to do with your time then investigate obsolete versions of Mac OS X.

😝

To answer your question, no there are no licensing restrictions against installing OS X 10.0 or 10.1 in a virtual machine on Apple hardware. You will, however, run into issues with:

• locating and obtaining legal versions of OS X that are that old, and
• getting them to install and run in virtual machines on a new Mac.

I would be very surprised if you could actually do what you were proposing to do in your original post. You will likely have more success looking for older Macs that can natively run the OS X versions you want.

G3 would be good for Mac OS X through about 10.5. It can not run 10.6, because that version is all Intel, no native PowerPC processors after that.

But there is a bigger problem coming:

Readers are starting to complain that Safari versions older that the version shipped in 10.9 are starting to generate warnings they will soon be refused Internet connections to sensitive websites, such as banks. For another few months, you can run Firefox to get around that problem and buy some time. After that, there will be far less demand for Macs that cannot run 10.9 Mavericks or later.

I spent a lot of time repairing and maintaining G3 and older Macs for schools that could not afford them. But when the expectations advanced to the point where computers should able to full motion Videos off the Internet, even the schools dumped the computers I had given them for free for more modern computers. A lot of what I had learned was suddenly useless.

I urge you NOT to spend your time on this old technology. Learn about the most modern stuff you can afford, and learn everything you can about it.

Dust it off. It's just what you need to run OS X 10.0 and 10.1.

Grant: I understand your concern, but there are reasons other than productivity for running old software, and nostalgia and hobbyism are two. Sort of like restoring and driving vintage automobiles. It sounds like that's what the OP wants to do, nothing wrong with that!

iOSAndroidRebel wrote:

Oh yes, I use a top spec Mac Pro and a top spec Macbook Pro. But, at my house, I have 500 PowerPC Mac computers, collected from 1984 to 2007.

I now feel much better about the number of Macs occupying space in my home. Thank you!