Pekka Väänänen has a great blog post on running the classic PC game Quake on an oscilloscope! The post has an overview of how Pekka takes the 3D primitives in the game and uses them to drive an oscilloscope’s X-Y mode, much like a classic vector arcade game. A computer soundcard is used to generate analog signals for the oscilloscope, and the limited bandwidth gives the edges of the world an eerie distorted quality that fits the mood of the game perfectly. Nice work!
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