Atari 2600
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The Atari 2600 was the first video game console to have wireless controllers. The Atari CX-42 joystick controllers used radio waves to transmit information, and they released in 1983.
It is possible to play an Atari 2600 using a Sega Genesis controller. The reason why the Sega Genesis controllers work on the Atari 2600 is because both the Genesis and the 2600 use DE9 ports. These ports were a popular type of port, and were used for the Sega Megadrive, the Atari 7200, Commodore 64, MSX, and the 3DO.
Contributed by peanutgamer
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There was going to be a peripheral for the Atari 2600 called the "Mindlink" that made it possible to play games with your mind. Atari said the device would allow users to "think" the movement of objects on the screen. The product however simply read electronic impulses in the forehead whenever the user moved their eyebrows, rather than actual brain waves.
Contributed by peanutgamer
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The CVC GameLine cartridge made it possible to download games via phoneline for the Atari 2600 in 1983, over 20 years earlier than services like Xbox Live Arcade.
Contributed by DidYouKnowGaming