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I remember when I was in High School between 2003 and 2007, the high school I went to had a bunch of old Pioneer laserdisc players that they used to show pictures with pertaining to the class discussion topics (mostly it was in the science and social studies classes that they were used in) and some of the old laserdisc players could be controlled with computer software, using a serial port or a 15-pin videogame joystick type port (like the ports you often used to find on old sound cards back in the day.)
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