I'm trying to get a Mac 12" RGB display to work with my Mac IIx. The IIx has a Mac II High Resolution video card installed, which according to this supports the weird 512x384 resolution the monitor demands. However, I get the weird pattern shown in the attached photo. This seems to be some issue with resolution, but I don't have an LC-series Mac handy to try the monitor with, so I can't rule out any hardware issues with the monitor. What could be the problem here?
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