As copper chips come to market amid reports of low or even zero yields, IBM Corp remains bullish about the technology it pioneered. Bill O’Leary, director of communications at IBM Microelectronics, said that the company is shipping copper interconnect parts to Apple Computer Corp and for its own S/390 mainframes. We’re able to get sufficient yields where maybe others aren’t, O’Leary said. Others involved in the rush to copper include Motorola Inc and UMC Group; Intel Corp has conspicuously delayed moving to the new technology. รก