3 ms·
The first modems were only in audible ranges: https://en.m.wikipedia.org/wiki/Acoustic_coupler https://en.m.wikipedia.org/wiki/Acoustic_coupler
by goldenkey 9y ago
The first modems were only in audible ranges:
https://en.m.wikipedia.org/wiki/Acoustic_coupler https://en.m.wikipedia.org/wiki/Acoustic_coupler