Der 56k Modem Klang - The 56k dialup modem sound - YouTube
The Dial-up Internet Sound (With MP3!) - YouTube
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Dial up sound (EARRAPE) by SkibblesMctibs Sound Effect - Tuna
Freesound - The Sound of dial-up Internet by wtermini
How A Dial-up Modem Handshake Works | Hackaday
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