The first personal and home computers booted into a ROM, or read-only memory, that usually consisted solely of an on-chip BASIC interpreter.

However, when Steve Jobs held the little device aloft revealing it to the world for the first time, it wasn’t running iOS 1. Instead, it was reported by Apple to be powered by OS X, the software ...

From the problems with the first edition (it was slow ... of the various versions of the Mac operating system, showing how it has developed over time, take a look at our video above.