the category of mainstream motion video accelerator with a series of video image processing circuits, branded VIPeR. VIPeR chips provided relatively high quality live and computer generated video. The chips were used in on high-end video solutions from companies like Matrox and Jazz Multimedia. Competitors integrated less elegant algorithms inside their mainstream graphics controllers - a trend Tseng followed with its latter generation of chips. Tseng was a victim of the graphics card shakeout of the mid-1990s, losing market share to S3 Graphics and ATI Technologies. Tseng was especially late to integrate a RAMDAC into its product-line, not succeeding until the ET6000. In the later years of the ET4000's lifetime, the lack of an integrated RAMDAC severely hurt Tseng's competitiveness. Struggling to source adequate supplies of memory for their updated cards, and lacking the funds to complete development of a modern integrated 3D engine (the ET6300), the board decided to abandon plans to ship a next generation part, and chose instead to preserve the cash pile, and seek a buy out instead. This strategy eventually resulted in the company’s engineers and graphics expertise being purchased by ATI (now a part of AMD) in December 1997. Tseng's management chose to use the proceeds of the sale, along with the existing cash reserves, to invest in a start-up, and merged the company with pharmaceutical company Cell Pathways in 1998. The latter was acquired by OSI Pharmaceuticals in 2003. References American companies established in 1983 American companies disestablished in 1998 Computer companies established in 1983 Computer companies disestablished in 1998 Defunct computer companies of the United States Defunct computer hardware companies Defunct semiconductor companies of the United States Graphics hardware companies