National Semiconductor Corp has sold out of 100Mbps Ethernet local networking chips, a product in which it claims to be the market leader, its chief financial officer, Donald Macleod, told the Robertson Stevens & Co technology conference last week. Adding that the company sees bright opportunities this year in the Ethernet, wireless communications and consumer markets. NatSemi says the closing of the sale of its Fairchild Semiconductor unit will take place in four to six weeks, and it says it will invest proceeds from the $550m sale of Fairchild in aggressively putting together infrastructure to lead in its remaining businesses of chips for communications and consumer systems, personal systems and analog and mixed-signal products.