The '640K' quote won't go away -- but did Gates really say it?
Here's the legend: at a computer trade show in 1981, Bill Gates supposedly uttered this statement, in defense of the just-introduced IBM PC's 640KB usable RAM limit: "640K ought to be enough for anybody."
The initial PC was based on the Intel 8088, which was a hybrid 8/16-bit processor — thus the reason for the 640KB memory limit. Though tiny by today's standards — 64-bit systems can support up to 128GB of memory — 640KB at that time was an order of magnitude larger than the 64KB limit that faced users of 8-bit computers, such as the Apple II+ and the Commodore 64.