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The company made key contributions to the evolution of modems. In the late 1960s, Codex was the first company to mass-market high-speed, 9600 bits per second modems that were based on quadrature amplitude modulation (QAM), and was also the first to introduce large scale integrated circuits (LSI) in modems .
Codex Corporation had its initial public offering in 1968, and in the early 1970s it held about 20% of the high-speed modem market. After losing much of their profitable military business, headquartered in Mansfield, MA, the company was in 1981 acquired by Motorola.