Wall Street Expected to Slip at Opening  LONDON (Reuters) - Wall Street was expected to dip at  Thursday's opening, but shares of Texas Instruments Inc.  &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=TXN.N target=/stocks/quickinfo/fullquote"&gt;TXN.N&lt;/A&gt;, may climb after it gave upbeat earnings guidance.