[Sirened]

I think the titular question is more rhetorical than actually attempting to give you a count. Lots of people do really think that there is one "computer" in their laptop when in fact the question of what a computer even is poses a way more difficult question. I loved the note on the MMU because it, aside from being a hilarious conference talk, poses the question of where we can even draw the line because clearly if the MMU can implement full programs than surely it's wrong to draw the line at the borders of a core on a SoC. Modern hardware is really funky and cool, and this article provides a good introduction to the chaos.