Retro console video hardware as an FFGL effect: a real machine's raster, palette and attribute cells, plus scroll-register distortion and glitches that corrupt the indices, so even a machine in the middle of falling over never shows a colour outside its palette. Now with the Amiga: 12-bit registers, Extra Half-Brite and an exact HAM6 encoder.
This demo runs the plugin's shaders in your browser, so it needs JavaScript and WebGL2. The plugin itself, its source and its downloads are on its project page.