An FFGL source that plays an Amiga cracktro (copper bars, a sine scroller, a starfield, a spinning cube and bobs), written against an emulation of the chips that drew them: chip RAM, the copper, 32 twelve-bit colour registers, five bitplanes, eight sprites and the blitter. Crossing bars can't blend because a register only holds one value, a mid-line colour change lands on the copper's four-pixel grid, and every channel is a multiple of 17 because a gun has four bits.
This demo runs a port of the plugin's chip emulation and its own shader in your browser, so it needs JavaScript and WebGL2. The plugin itself, its source and its downloads are on its repository.