US Robotics 3CP3453 Courier External 56K External Analog Modem
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
3Com U.S. Robotics 56K UFR833R0DH52 Fax Modem | eBay
U.S. ROBOTICS 56K MODEM PC CARD WITH X-JACK 3056 PCMCIA - Walmart.com
3Com 002806-00 V.Everything External V.90 ITU 56K Modem