In the early 1990s, Sculley led Apple to port its operating system to run on a new microprocessor, the PowerPC. Sculley later acknowledged such an act was his greatest mistake, indicating that he should instead have targeted the dominant Intel architecture. After a bad first quarter in 1993, amid a personal-computer price war and internal tension over the company's direction, Apple's board forced Sculley out. He resigned on October 15, 1993 and was replaced by German-born Michael Spindler, who had been Chief Operating Officer. Spindler was ousted three years later.