... from Atari Falcon 030. There is no scandoubler or any additional hardware just VGA cable.
BUT it is not ideal like Dell U2410M!!! You can see that some screens in this demo (Lost Blubb / Lazer) are not displayed* - U2412M can display only some "15KHz resolutions" (around 15KHz)!

but nice thing is that you can set 4:3 aspect ration.

*in top left corner is original demo recorded from RGB 15KHz monitor.