I did this a while back: https://hackaday.com/2005/10/25/audio-output-from-a-serial-port/ https://hackaday.com/2005/10/25/audio-output-from-a-serial-p... (Loo

I did this a while back: https://hackaday.com/2005/10/25/audio-output-from-a-serial-port/ https://hackaday.com/2005/10/25/audio-output-from-a-serial-p... (Looks like somebody mirrored it to github at https://github.com/koniu/ttyplay https://github.com/koniu/ttyplay)