On January 24, 1984, Steve Jobs demonstrated the original Macintosh for the first time at an Apple shareholders meeting in Cupertino. You've probably seen a video of the presentation; it's the one where Jobs is introduced by a joke-telling Mac.
But what many people don't know is that the Apple co-founder gave another presentation for the computer less than a week later at a meeting of the Boston Computer Society. And that presentation has remained largely unseen until this weekend...