Few people have heard of it, yet many consider John Blankenbaker's KENBAK-1 to be the first commercial personal computer.

Koss introduced these headphones over 40 years ago, and they remain affordable favorites to this day.

Wrist Computers

Epson RC-20
I just stumbled upon Pocket Calculator Show's "For Sale" page. They're offering a plethora of vintage wrist computers and digital watches to the unwashed masses (that's us).

The strangest is the Seiko Epson RC-20 Wrist Computer (above). It packs a Zilog Z-80 microprocessor and a touch screen interface in a package small enough to strap to your wrist. The idea was that you wrote some incredibly cool programs on your home PC, downloaded them to your watch, and then ran around the neighborhood demonstrating your coding prowess until the Cops arrived to subdue you. Very cool nonetheless.

Other offerings include a copy of the Seiko digital watch worn by James Bond in The Spy Who Loved Me, a red Seiko wrist computer, and the tremendously daft Casio GM-1 10-in-1 Game Watch.

Digital Retro Watches (Pocket Calculator Show)

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