I did a quick test of the second SE. As it turns out, it does have a hard drive. It's mounted on one of those brackets designed for dual-floppy SEs. However, it does not have a second floppy--there is neither a slot cover nor a drive, just a gaping hole on the front bezel.

This SE appears to have some analog board problems, but its logic board seems fine. It also has a 260MB drive installed, whereas the other SE has a MiniScribe (20MB); this can be determined by the unique sound the computer makes when it starts up.

I think I'm going to combine these two computers and recycle the case/chassis of the lesser SE save for the drive bracket. I'm not sure if I'll use this in the other SE or not, although I would have an extra floppy to install from the beater SE.

I also noticed the ADB keyboard (original model) has a broken ADB port on its right side. It's not a big deal since I'll be using it with an SE (which has two ADB ports) but still worth noting. It works otherwise, but the SE's mouse isn't the greatest--the button is completely worn down. I swapped it out with another mouse from my closet (an original brown ring square model).

Testing the rest of the Macs will have to wait. I'm busy the rest of the week and probably won't get around to anything but the SE repair within the next four days. Cleaning the SE and IIvx (which got the Apple Color Display from my LCII, currently out of commission due to bad caps and unlikely to be re-capped anytime soon due to my IIci being a higher priority) took a long time. The SE's keyboard, in particular, was awful.