The TI community reached the height of its popularity in the early 2000s, with many new websites and programming groups being started. In fact, the aforementioned community sites were exploding with activity, with close to 100 programs being uploaded daily by users of the sites. Also, a competition existed between both sites to be the top site in the community, which helped increase interest and activity in the community. One of the common unifying forces that has united the community over the years has been the rather contentious relationship with TI regarding control over its graphing calculators. TI graphing calculators generally fall into two distinct groups—the older ones powered by the Zilog Z80 and the newer ones running on the Motorola 68000 series. Both lines of calculators are locked by TI with checks in the hardware and through the signing of software to disable use of custom operating systems. However, users discovered the keys and published them in 2009. TI responded by sending invalid DMCA takedown notices, causing the Texas Instruments signing key controversy. Competitors TI has the largest market share in the analog semiconductor industry, accounting for over $10 billion of the total US$57 billion market in 2020. Acquisitions In 1996, TI acquired Tartan, Inc. In 1997, TI acquired Amati Communications for $395 million. In 1998, TI acquired GO DSP. In 1998, TI acquired the standard logic (semiconductor) product lines from Harris Semiconductor, which included the CD4000, HC4xxx, HCT, FCT, and ACT product families. In 1999, TI acquired Libit Signal Processing Ltd. of Herzlia, Israel for approximately $365 million in cash. In 1999, TI acquired Butterfly VLSI, Ltd. for approximately $50 million. In 1999, TI acquired Telogy Networks for $457 million. In 1999, TI acquired Unitrode Corporation (NYSE:UTR). In 2000, TI acquired Burr-Brown Corporation for $7.6 billion. In 2003, TI acquired Radia Inc. for about $320 million. A San Jose based company, ASIC WiFi front end prototype without the base band processor. Radia Inc. has Israeli home office. In 2006, TI acquired Chipcon for about $200 million. In 2009, TI acquired CICLON and Luminary Micro. In 2011, TI acquired National Semiconductor for $6.5 billion. In 2021, TI acquired an operational 300mm fabrication plant located in Lehi, Utah from Micron for $900 million. National Semiconductor acquisition On April 4, 2011, Texas Instruments announced that it had agreed to buy National Semiconductor for $6.5 billion in cash. TI paid $25 per