The claim "...and they all rip off Rod Holt's design" is classic "reality distortion field" salesmanship. Lesson learned: don't be humble when you're the pitch man.
Even the claim that every other computer maker used switching power supplies certainly wasn't true at the time of the Apple II; its direct 6502-based contemporary the Commodore PET 2001 had a standard heavy transformer bolted to its thick metal chassis and large capacitors under the hood.
Even the claim that every other computer maker used switching power supplies certainly wasn't true at the time of the Apple II; its direct 6502-based contemporary the Commodore PET 2001 had a standard heavy transformer bolted to its thick metal chassis and large capacitors under the hood.