[p0w3n3d]

Wow that's amazing. I sometimes play NES emulated games, which are (due to hardware limitations) using some tricks while displaying larger mobs, to show a few sprites instead of one (and using monitor synch to quickly switch the sprites in between switching to another scanline). This however renders as blinking in my emulator.

I can only imagine that this demo was doing similar tricks to "push the limits" on CGA.

Also, I remember my i386-33SX playing full 4 channel music on the PC Speaker in the game "Pinball Fantasies". This was state-of-the-art (also not working properly on DOSBox emulator nowadays)