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When I was studying at the University of Stuttgart, I once saw a demonstration where they were playing music over a regular radio by running a program on one of the old fridge size computers (can't remember which). The radio waves were just a side effect of it's vacuum tubes. It was a pretty neat trick, imho^^

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You used to be able to do this by showing certain images on a CRT. It was cool trick back in the day.

Tempest for Eliza¹ was doing the rounds some years ago. I'm sure there were other implementations in the wild, but I can't remember their names.

1. http://www.erikyyy.de/tempest/

Yup! That's the one I remembered. On a side note, I wish they still made sites that look like that one.

this was also the way to generate audio in old trs80 games (the Model-I had terrible RF shielding).

I wonder if the radio waves could have been received and read as data by another machine.

Probably. For example

https://arxiv.org/pdf/1411.0237.pdf

and for that matter all of

https://scholar.google.com/citations?user=F8gvBUkAAAAJ&hl=en...

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