'This is What a Dial Up Modem Connection Looks Like on the Spectrogram (DTMF Handshake and Call) - Truth or Fiction?
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I figured out what the sound of the old dial-up connection "Pyohyoroloro ~ ♪" was what it is - GIGAZINE
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A Nostalgic Compilation of Dial-Up Modem Sounds
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Dial Up Modem Handshake Sound Spectrogram : U2UBER : Free Download, Borrow, and Streaming : Internet Archive
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El nostálgico sonido del módem, en vídeo
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I figured out what the sound of the old dial-up connection "Pyohyoroloro ~ ♪" was what it is - GIGAZINE
How A Dial-up Modem Handshake Works | Hackaday
