1981, and Philips was able to freely use the Philips name, alternating with the Magnavox name for some electronics, with the personal care business continuing to use the Norelco name. In the late 1970s, Philips developed LaserDisc technology, producing an optically read, 12 inch disc that would contain recorded video material. In the early 1980s, Philips worked with Sony to create a standard for optical audio discs (CDs), using the technology developed for the LaserDisc. Teamed with Sony, Philips used the Magnavox brand name to introduce the CD-DA standard and equipment for consumer audio with the Magnavox player sold in department stores while the Sony CDP-101 went to high-end audio stores. During the late 1970s the company released the Odyssey², in Europe also known as Philips Videopac G7000. In the early 1980s, Philips merged Sylvania, Philco and Magnavox into one division headquartered in Knoxville, Tennessee, with a manufacturing plant in Greeneville, Tennessee. The Sylvania plant in Batavia, New York, was closed and all operations moved to Greeneville. Philips also abandoned the Sylvania trademark which is owned by Osram. In the late 1980s, Magnavox sold the Magnavox/Philips VideoWriter with some success. Released in 1985, the VideoWriter was a standalone fixed-application word processing machine (electronic typewriter). Philips Computers, primarily based in Canada, sold its products in North America under the Magnavox brand with minor rebadging in logo and color scheme of computers, monitors, peripherals and manuals. Philips exited the proprietary personal computer business in 1992. Philips sold the Greenville plant in 1997. In the 1990s, several Magnavox branded CD-i players were marketed by Philips. Starting in the early 1990s, some Philips electronics were marketed under the brand name "Philips Magnavox", in an attempt to increase brand awareness of the Philips name in the United States. While it did work to a degree, it also caused confusion to the consumer as to the difference between "Philips Magnavox" products and "Philips" products, resulting in Philips marketing the two brands separately again. The defense electronics group, centered in Fort Wayne, Indiana, remained independent under the Magnavox Electronic Systems name, first under Philips and later in the Carlyle Group, until it was acquired by Hughes Electronics in 1995. The three areas of business of the MESC operation during the late 1980s and early 1990s were C-Cubed (Command, Control, and Communication), Electronic Warfare, and sonobuoys. When Hughes Electronics sold its aerospace and defense operations to Raytheon, the