My favorite is how they managed to get Connectix Virtual from 1989 to support the Macintosh IIci. Even https://tidbits.com/1994/07/25/transition-to-powerpc-ram-dou... mentions that "I want to thank the PowerPC software team in particular for spending two hours with us in March thumbing through the source code answering specific questions were stuck on at that crucial stage of the project. "