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(3Com Corporation, Marlborough, MA, Founded in 1979 by Ethernet pioneer Bob Metcalfe, 3Com was acquired by HP in 2010, and its products were fully merged into HP's product lines. Offering a wide variety of network adapters, hubs and related products, 3Com was a leading networking and communications hardware vendor deriving its name from "Computer, Communication and Compatibility."

In 1997, 3Com and U.S. Robotics merged. Retaining the 3Com name, it created a USD $5 billion dollar company with more than 12,000 employees and was the largest merger in the history of the data networking industry. In 2000, 3Com spun off U.S. Robotics as an independent, privately held company.

3Com used to develop and support a line of network operating systems, which it discontinued in 1993. 3+Share was a DOS-based network operating system for PC and Mac clients. 3+Open was OS/2 based and supported DOS, OS/2 and Mac clients. See U.S. Robotics.

U.S. Robotics

(U.S. Robotics, Inc., Schaumburg, IL, A modem manufacturer highly regarded for its quality products. The company manufactures its own chipsets (data pumps) and often leads with innovations. Its HST protocol was a high-speed, reliable protocol before V.32bis became a modem standard in 1991, and USR's Sportster models were the best-selling modems in the world.

In 1997, the company became part of 3Com in the largest merger in data networking history. In 2000, it was spun off again as a private, independent company formed by an alliance between 3Com, Accton Technology Corporation and NatSteel Electronics, Ltd. See 3Com.

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