I actually saw one back in the early 90's that had one. It just gave you something to do while waiting a half hour for a game to load. Hard drive held a whopping 250 mb.
That was a fairly modern machine. My first PC had a turbo button that doubled the speed from 4.77mhz to 10mhz. I had 10mb of hard disk space on that machine, which seemed like plenty because it was still a floppy world.