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I have a 2012 27-inch iMac. Running High Sierra 10.13.6. In lieu of buying a new iMac could I buy a mac mini instead and just use my current iMac's display and my wireless keyboard and mouse to effectively upgrade?
You can't use your iMac as a display for a 2020 Mac.
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."
You can't use your iMac as a display for a 2020 Mac.
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."
Yes its a good idea to re-use the iMac display in Target Display Mode.
The only caveat is that newer Mac Minis don't support target display mode.
I believe you can re-use your 2012 iMac but you have to run an older OS.
I have used it successfully on an older Mac Mini (2012).
I think newer Minis with USB-C (TB3) may not work with TDM.
For my M1 Mini (2020), I use the 27" Apple Thunderbolt display with the TB3-TB2 adapter.
Will not work with your iMac though....
Mac mini as an upgrade for an older iMac
