For some reason I was looking back through sold items on ebay and came across this apple II plus which the seller says was owned by his uncle who worked for NASA in the 80's and 90's. What caught my eye was the "third" drive case which turns out is a power supply? That's the best I can tell, but I wasn't able to find details through my sup'r'crappy search skills so I though I'd ask here.
I'm posting all image so they don't disapper when the listing does. I've also never seen an internal fan for the IIplus like this. I'm guessing the uncle drove this thing hard and the "switcher" is power supply given there only appears to be power lines coming out. The think that looks like a debugger break switch also caught my eye but I can't see enough of the cards to know what's installed.