This excerpt taken from the TXN 8-K filed Feb 17, 2006.
Section 1. Registered Office. The registered office of the Corporation in the State of Delaware shall be at 100 West Tenth Street, in the City of Wilmington, County of New Castle, and the name of the registered agent in charge thereof is The Corporation Trust Company.
Section 2. Other Offices. The Corporation may also have a general office in the City of Dallas, State of Texas, and may also have such other office or offices, either within or without the State of Delaware, as the Board of Directors may from time to time appoint or as the business of the Corporation may require.