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Helpful answers
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Jul 4, 2015 2:12 AM in response to Edwin521by dominic23,Sorry. You cannot install an earlier version OS X on a new Mac.
For details:
https://support.apple.com/en-us/HT201686
Best.
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Jul 4, 2015 5:31 AM in response to Edwin521by Barney-15E,As dominic stated, it isn't possible to install Mountain Lion on a new Mac. It may be possible to install one previous OS (Mavericks in this case), but since Yosemite has been out this long, I'm pretty certain the new Macs have hardware that even Mavericks doesn't have the drivers for.
Apple doesn't back-fill its older OS's with drivers for the new hardware. It just releases a new OS with the necessary drivers.