US Robotics Modem 56k "Sportster Flash" - from circa 1995 : r/vintagecomputing
RetroTech Chris on Twitter: "Testing out my "new" US Robotics 56K Faxmodem. Dialed up the Diamond Mine BBS. Sound on if you like modem sounds. https://t.co/4yoKUNi1ji" / Twitter
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56K Message Modem User's Guide and Reference
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U.S. Robotics USR5686G V.92 Serial Controller Faxmodem 56Kbps RS-232 (Serial Port) Modems / Gateways - Newegg.com