Every story and comment from the Hacker News API, in a layout borrowed from 2001.
A comment on Ask HN: How did/does the "dial tone" work?.
There is actually a picture of the dial tone generator in Flickr. Motor was moving generators on various speeds. https://www.flickr.com/photos/9479603@N02/1814546737/in/phot...
As regards to logistics of tones and stuff. You dont want to know. It involved multi-level signalling of currents and voltages.
There are no comments on this comment yet.
There is actually a picture of the dial tone generator in Flickr. Motor was moving generators on various speeds. https://www.flickr.com/photos/9479603@N02/1814546737/in/phot...
As regards to logistics of tones and stuff. You dont want to know. It involved multi-level signalling of currents and voltages.