Use an old iMac Screen for a Thunderbolt 3 Mac

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Because of the decreasing value of older computers and sometimes children leaving the nest and their old computers behind, you could wind up with an old iMac that no longer meets your day-to-day needs. Why not transform it into a monitor?

All the iMacs models that can work in what Apple called Target Display Mode as a secondary display for a modern Mac require an adapter to connect a Thunderbolt 3 port on the iMac to a Mini DisplayPort or Thunderbolt 2 port on the older iMac, and have it function as expected. (Apple appears to have recently removed all mention of Target Display Mode from its site: its former FAQ redirects to an introduction to using Catalina.)

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