No problem admitting that I know next to nothing about Apple IIs. For my Apples all I have are either monochrome displays or Performa display. So today I decided to give a Performa display a go. All I get is garbled video. I assume the native resolution of the display will not work with the IIgs, but I want to be certain. I tried both the display port on the motherboard and the one off of the Apple video overlay card. Identical results. The RCA out works fine.

Assuming the color display is a no-go, what color display should I look for?