Any help on configuring that? I did the Option+Open Monitors & Sound control panel trick, and it didn't work.

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It really depends on what model of Mac you are using as many of the 68Ks are limited to 800x600 as their max output resolution. I think when I had mine running at 1024x768 it was actually connected to a PC, but I can't remember. Will have to dig it out and give it a try with a few different Macs to see...