[kazinator]

I remember writing a piece of machine language on a C-64 which flipped the color palette as fast as possible. It was so fast that all you saw was individual horizontal line segments of different colors within every individual raster line. (I.e. it was faster than the horizontal refresh rate of the CRT which is usually what, well over 10 kHz.)

Sheesh, when was that? Probably 1985.

[Flow]

Mid-rasterline color splits, often combined with snakes of sprites, often with border removal effects.

Watch this demo for state-of-the-art in that kind of programming on the C64.

https://www.youtube.com/watch?v=lseBxJYpz54