The cathode-ray tube is a vacuum tube that contains one or more electron guns and a phosphorescent screen, and is used to display images. It modulates, accelerates, and deflects electron beam onto the screen to create the images.
Used as a display to play the game Super Smash Bros. Melee, on the Nintendo GameCube.
CRT's exist in 2019 because of Super Smash Bros. Melee.
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