A computer virus over the weekend disrupted the operations of the Asian manufacturer that makes chips for the iPhone and other devices offered by top shelf high-tech companies. The Taiwan Semiconductor Manufacturing Co. said that a virus outbreak Friday evening affected a number of computer systems and fab tools at its facilities in Taiwan. The incident likely will cause shipment delays and create additional costs, the company said, as well as a 3 percent reduction in revenue and a 1 percent decline in gross margins in the third quarter.