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by tpmx 2280 days ago
The first Walkman had two headphone jacks:

http://www.walkman-archive.com/gadgets/walkman_sony_01_tps-l...

And this feature:

> the TPS-L2 had a "hotline" button which activated a small built-in microphone, partially overriding the sound from the cassette, and allowing one user to talk to the other over the music

https://en.wikipedia.org/wiki/Walkman_effect

> Sony Chairman Akio Morita added these features to the design for fear the technology would be isolating. Though he "thought it would be considered rude for one person to be listening to his music in isolation"), people bought their own units rather than share and these features were removed for later models.