Intel shares plunged $5 or 19% to $22, dragging the rest of the tech sector with it. Other chipmakers saw selling as well, with Advanced Micro Devices tumbled 81 cents or 7.6% to $9.80 and Texas Instruments was down $1.30 or 4.7% to $26.39. Dell Computer, which had forecast a rebound in PC demand, erased much of its early loss to close off 19 cents or 0.7% to $26.28. Sun Microsystems dropped 21 cents or 3.2% to $6.42. IBM came off $1.36 or 1.7% to $78.30.