Break down of a C64 demo effect

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So I recently made this little sinewave demo effect on the Commodore 64: This generated a lot of lively discussion on twitter and /r/c64 . A bunch of people were curious as to how it works and I promised to explain it on my blog. The main idea is to use character mode with a custom character set. I sample y-coordinate every 8 pixels to produce a list of line segments [(0, y 0 ),(8, y 1 ),(16, y 2…

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