Dial-up internet was defined by a distinct sound — Quartz
How A Dial-up Modem Handshake Works | Hackaday
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Dial-up internet was defined by a distinct sound — Quartz
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This is What a Dial Up Modem Connection Looks Like on the Spectrogram (DTMF Handshake and Call) - Truth or Fiction?
Why Did Dial-Up Modems Make So Much Noise?
Spectrogram Visualization of a Dial-Up Modem Handshake Sound
The Bleeoo Project demands your best dial-up modem impression - CNET
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This is what a dial up modem connection looks like on the spectrogram (DTMF handshake and call). : r/interestingasfuck
What is a suitable emulator of dial-up modem sounds? - Quora
Dial Up Modem Handshake Sound - Spectrogram - YouTube
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File:Modem-usr-courier-v34-front-online.jpg - Wikimedia Commons
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Dialup modem handshake protocol (the squeals from the speaker) explained visually : r/geek
Dial-up Internet access - Wikipedia
