I'm planning to give a talk at a conference, and I've been told that slides will be displayed on a screen with a resolution of "2048 x 1080 (16:9 aspect ratio)".
I want to see how my slides look at that resolution. I have a Macbook Pro (non-retina screen) running OSX Mavericks and no external display.
In System Preferences, I can choose between only two "scaled" resolutions: 1280 x 800 and 1024 x 640.
Is there a way that I can use an unlisted resolution?