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Modern Upgrades for the Hayes Chronograph
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AT' (Hayes) Serial Modem Operation Manual (Draft) | The High Nibble
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Why Did Dial-Up Modems Make So Much Noise?
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Hayes 1200 Smart Modem! - YouTube
Retro Thing: Getting Online: The Hayes Smartmodem
Hayes Microcomputer Products - Wikipedia
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Hayes compatible modem: What it means - Silicon Underground
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