macOS compatibility: What macOS versions can my Mac run? | Macworld
How to add Continuity features to older Macs
Unibody MacBook Pro Mac OS X and Windows Compatibility: EveryMac.com
![macOS Big Sur on Unsupported Macs [2008-2013] OpenCore Legacy Patcher!!! - YouTube](https://i.ytimg.com/vi/flQRKWBKC60/maxresdefault.jpg "macOS Big Sur on Unsupported Macs [2008-2013] OpenCore Legacy Patcher!!! - YouTube")
macOS Big Sur on Unsupported Macs [2008-2013] OpenCore Legacy Patcher!!! - YouTube
The MacOS Sierra Compatibility List | OSXDaily
macOS compatibility: What macOS versions can my Mac run? | Macworld
Mac OS 9 - Wikipedia
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iMac 21.5" Late 2009 (10,1) - CPU Upgrade E8600 | MacRumors Forums
macOS - Wikipedia
A-Tech 32GB (4 x 8GB) PC3-8500 DDR3 1066/1067 MHz RAM for iMac Late 2009 27-inch (Quad-Core i5/i7) | 204-Pin SODIMM Max Memory Upgrade Kit at Amazon.com
Identify your iMac model - Apple Support
Identify your iMac model - Apple Support
What to Do if Your Mac Can't Run macOS Sierra - The Mac Security Blog
Macs Able to Run macOS Sierra Remain Compatible With High Sierra - MacRumors
OS X El Capitan Compatible Macs and System Requirements: EveryMac.com
Leaping Into a System Upgrade - The New York Times
How to Prepare Your Mac for macOS High Sierra - The Mac Security Blog
Identify your iMac model - Apple Support
MacOS High Sierra Compatible Macs List | OSXDaily
Find Out: If OS X Mountain Lion Is Compatible With Your Mac Book Pro / iMac / Mac Mini - nixCraft
The evolution of macOS (and Mac OS X) | Computerworld
iMac (Early 2009) | Low End Mac
The MacOS Sierra Compatibility List | OSXDaily
Vectorworks Operating System Compatibility List - Knowledgebase - Vectorworks Community Board
