Xircom (XIRC) , a maker of network adapters and modems, was up 35.6% in preopen Island trading. Semiconductor giant Intel (INTC) - Get Report said Monday that it would offer $25 per share for all of Xircom's stock within 10 days. Xircom closed at $18.06 on Friday. Intel said the $748 million deal gives it a strong lineup of mobile computing products. Intel was up 0.8%.