OS X El Capitan Compatible Macs and System Requirements: EveryMac.com
Leaping Into a System Upgrade - The New York Times
The MacOS Sierra Compatibility List | OSXDaily
The MacOS Sierra Compatibility List | OSXDaily
What Version Of macOS Can My Mac run? | Macworld
MacOS High Sierra Compatible Macs List | OSXDaily
Can't install *any* OS on Late 2009 iMac : r/MacOS
The macOS Sierra Compatibility List
Hard Drive for iMac Late 2009-2011 ONLY 500GB, Preloaded with High Sierra 10.13 | eBay
Identify your iMac model - Apple Support
Latest macOS compatibility chart : r/MacOS
Vectorworks Operating System Compatibility List - Knowledgebase - Vectorworks Community Board
5 Things to Know Before Upgrading Your 2009 or Later iMac
iMac Intel 21.5" and 27" (Late 2009-Mid 2010) SSD Upgrade Bundle - iFixit Store
Best Mac OS Version (Hint: macOS Sierra and higher) - MacMyths
iMac 21.5" Late 2009 (10,1) - CPU Upgrade E8600 | MacRumors Forums
Preparing a Mac for OS X 10.10 Yosemite
What Version Of macOS Can My Mac run? | Macworld
Using an iMac as a Monitor Is More Complicated Than You Might Think
iMac (Early 2009) | Low End Mac
Mac OS Compatibility Guide for iMac and Imac Pro | NiwTech
How To Install macOS Mojave On An Unsupported iMac ( Tutorial for incompatible iMacs ) - YouTube
macOS - Wikipedia
OS X Yosemite Compatible Macs and System Requirements: EveryMac.com
Identify your iMac model - Apple Support
