Apple didn't revolutionize power supplies; new transistors did

# Summary Steve Jobs claimed that Rod Holt's switching power supply design for the Apple II was revolutionary and that modern computers still use designs based on Holt's work, but this is factually incorrect. The actual revolution in switching power supplies occurred in the late 1960s through mid-1970s—years before the Apple II's 1977 release—driven by advances in semiconductor technology and switching transistors, not by Apple's design. Modern computer power supplies are completely different from Holt's design and do not derive from it.