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SE/30: Invert screen pixels?


New member
I would like to invert the screen from black on white to white on black. I recall there being a control panel which could do that, but I think it also only worked as a magnifier?

Anyways: does anyone know if something else exists? I feel like a system init going in and modifying QuickDraw bits might be resource intensive. How about flipping it in a modified ROM? I have a Rominator coming...

Or how about using op amps to flip the video signal driving the CRT?

Why would one want to do this? I slapped a green CRT in one of my 30's and it would look so much cooler inverted. :D


Well-known member
No extra hardware needed to accomplish this… the serial output stream of video data runs through one of the PALs, so you can just invert the output polarity in the fusemap and burn a replacement.