SAN FRANCISCO :Substrate, a small U.S. startup, said on Tuesday that it had developed a chipmaking tool capable of competing with the most advanced lithography equipment made by Dutch firm ASML.  Substrate's tool is the first step in the startup's ambitious plan to build a U.S.-based contract chip-manufacturing business that would compete with Taiwan's TSMC in making the most advanced AI chips, its CEO James Proud told Reuters in an interview. Proud wants to slash the cost of chipmaking by