I dunno if any of you remember, but in the 90's and 2k's you could buy a single-board computer that slotted into an ISA or PCI slot and acted as a very, very expensive watchdog for big servers. Well, history is repeating itself: here's a pi zero acting as a daughterboard for a pine64. 

![[Image: MhtIJU.jpg]](http://i.snag.gy/MhtIJU.jpg)