Apple iMac 2009 A1312 MB952LL/A 27" C2D E7600 3.06GHz, 12GB RAM, 1TB HD Catalina 885909286300 | eBay
Late 2009 iMac can use 4k second monitor – Ernst Renner
How to install macOS Catalina on an unsupported Mac
How to Install macOS Catalina on an Unsupported Mac - MacRumors
macOS Catalina Patcher
27" iMac Late 2013 w/Catalina 15 - computers - by owner - electronics sale - craigslist
Late 2009 iMac can use 4k second monitor – Ernst Renner
Installed macOS Catalina on my MacBook Early 2009 | .NET Development by Eric
Early 2009 20-inch iMac running macOS Catalina with the dosdude1 Catalina patcher. Runs great and has no issues! : r/CatalinaPatcher
Identify your iMac model - Apple Support (NZ)
MAC MINI 2009 CON CATALINA! - YouTube
SUCCESS - MacBook Pro mid-2009 (5,3). The DosDude Catalina Patcher worked perfectly, very first try. The Core 2 Duo runs Catalina better than I expected. : r/CatalinaPatcher