Re:Transmits AM radio on computers without radio transmittin...
by a_gopher on Thursday December 17, 2020 @05:55AM
(#25454435)
aka Sinclair ZX81. There was such a program in Your Computer that would toggle between fast and slow mode to generate tones. It was a actually a trivial 8 or 16 step tracker, so you could even make beats...
And here's the program listing!
https://archive.org/details/your-computer-magazine-1982-03/p...