2012 27" display
Can I use my old 2012 iMac 27" screen as a second display using the new 2020 iMac 27"
iMac, macOS 10.13
Can I use my old 2012 iMac 27" screen as a second display using the new 2020 iMac 27"
iMac, macOS 10.13
No.
Use your iMac as a display with target display mode - Apple Support
"You can connect any of these older iMac models to another Mac from 2019 or earlier for use as an external display."
No.
Use your iMac as a display with target display mode - Apple Support
"You can connect any of these older iMac models to another Mac from 2019 or earlier for use as an external display."
2012 27" display