[KerrAvon]

This part is factually incorrect:

> The easiest way to set that standard wasn’t just to sell machines; it was to let other companies sell parts, software, and even whole computers that would be compatible with your machine. Unlike all of its major rivals—including the Apple II—the IBM PC was built with an open architecture.

The Apple II was effectively as open as the PC. And IBM didn't want clones any more than Apple did. Both the Apple II and the PC were eventually legally cloned, and neither company could do anything about it.