National Semiconductor Down 9.4% Ahead of Earnings

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National Semiconductor

(NSM)

was down 9.4% in early trading. The chipmaker today is scheduled to release second quarter-earnings. The Street's estimate is 51 cents per share vs. the year-ago result of 37 cents.

Semiconductors were broadly lower in the wake of more evidence of slowing PC sales and a warning from

Motorola

(MOT)

.

The

Semiconductor Index

was down 3.9%. But sector bellwether

Intel

(INTC) - Get Report

was up 3.9% after striking a 52-week low Wednesday.