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On some machines, especially the early TRS-80 macines that had no sound, putting an AM Radio next to the device was an accepted way of getting sound because, as you discovered, the internal RF would modulate the receiver.
I think it's "The Creative TRS-80" from Creative Computing Press that had a program that would play Happy Birthday over a radio as a demonstration of how that worked.
On some machines, especially the early TRS-80 macines that had no sound, putting an AM Radio next to the device was an accepted way of getting sound because, as you discovered, the internal RF would modulate the receiver.
I think it's "The Creative TRS-80" from Creative Computing Press that had a program that would play Happy Birthday over a radio as a demonstration of how that worked.
(post is archived)