Apple Macintosh Plus in a scene from Star Trek IV, The Voyage Home from 1986
The Macintosh Plus came out January of the same year and I think it was one of the earliest examples of product placement
It had a Motorola 68000 CPU running at 8Mhz (pitiful by the standards of The Enterprise) and only 1 MB RAM. Not nearly enough to fight Klingons with. Which is probably why they didn't use it for that purpose
@drwho We call this the "Two Finger, Search and Destroy" method :P
@cypnk :D