incrediBILL - 1:02 am on Nov 22, 2012 (gmt 0)
Since we're on the topic of ancient electronics, anyone else ever have a crystal radio? I don't know if I still have it, but I did have one and they use NO batteries whatsoever. With the mere radio energy in the air you can tune a channel and power an ear bud to listen to the radio.
While crystal radios aren't computers some of my earlier computers running in the 1Mhz range had circuits you could toggle at just the right speed and generate RF noise that would play music over an AM radio or a crystal radio :)
FYI, that RF noise over an AM radio was the "sound" for many of my early video games until someone finally wised up and made a small jack port for the computer which was the start of MP3 players.