I remember reading that the Apple 2e was the first device with a switching power supply and the power supply design revolutionized power supply design for years to come. Is that true?
In the book "I, Woz", Steve Wozniak explains that Jobs hired a random hacker Rod Holt to design switching mode power supply unit for their Apple II computer. Jobs paid him $200 a day which was a lot of money by that time. Rod did the best work he could.