(Cyrix Corporation, Richardson, TX) Founded in 1988, Cyrix was a manufacturer of x86-compatible CPU chips. Its first product was a math coprocessor. In 1992, it introduced a line of 486 CPUs, later followed by the 6x86 Pentium-class and 6x86MX Pentium II-class chips. In 1998, Cyrix was acquired by National Semiconductor and operated as a wholly owned subsidiary. In 1999, National Semi sold its Cyrix processor business to Via Technologies, Inc., a leader in PC chipset design. See also Citrix.