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HFguy · June 7th 07, 08:57 AM posted to rec.radio.shortwave

wrote:

In the early days of computing, before sound cards (or even enough CPU
horsepower to think about making anything fancier than an text
display), hobbyists would write software programs that would
indirectly cause music on AM radios by running different patterns of
use over the lines running out of the CPU. Same idea, just they were
doing it deliberately and your flashlight does it as a side effect.

This was done on an 'Altair' kit computer in 1975. The Altair is
considered to be the first personal computer.

http://www.digibarn.com/collections/...ing/index.html