Scotty, I have a question. I am trying to connect my mid 2012 Retina MacBook Pro with Mac OS Mojave to my older 30 Apple Cinema Display (Approx 2010). It has four leads on it and an aluminum surround.
I am unable to display the resolution of the screen (2560x1600).
Is it possible to get this resolution from my MacBook Pro and if so, how can it be done?
Thanks
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The 30" display was capable of supporting that res and was the optimal res. It could be a limit of the adapter you're using. What adapter are you using?

mini display port to DVI
mini display port to VGA
hdmi to DVI or VGA
USB-C to….

etc…

You can take a pic of the adapter.