Tech Stocks Tumble as Intel Disappoints  NEW YORK (Reuters) - U.S. technology shares tumbled on  Friday after Intel Corp. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=INTC.O target=/stocks/quickinfo/fullquote"&gt;INTC.O&lt;/A&gt;, the world's No. 1 chip  maker, slashed its revenue forecast, but blue chips were only  moderately lower as drug and industrial stocks gained.