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 was 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 now…

Time’s Harry McCracken (via MacRumors) managed to track down a video of Jobs’ first public Macintosh demonstration, which was shot by a local videographer. It had been tucked away for nearly 30 years, stored on a media format called U-matic.

Here’s the clip, which is surprisingly high-quality for a 3 decade-old amateur job. It’s about 96 minutes long.