Zx spectrum Gigascreen mode.
YES, ZX mode!
If you just change two screens that make up this picture, it flickers badly. It is best to look at the LCD display (TV or monitor) and add software interlaced (only even lines on one screen, not even on another and change them). Then the flicker is much less. Something like "IFLI" on the commodore, but with a little more "jitter" of the picture.
I would really love to see how much this stuff flickers on actual hardware.
ahahahahaa : D