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Boosted by jwz:
jwz wrote:

@mwichary The "analogtv" module in XScreenSaver almost does that; it's a circuit-level simulation of NTSC and its various faults, so it's at the "analog logic" layer rather than the "physics" layer.

https://github.com/Zygo/xscreensaver/blob/master/hacks/analogtv.c

You can see the effect in action on most of the images posted on the @dnalounge account.