
It was formerly attached to an "LCD-286" lunchbox PC.
My camera photo didn't come out, so it's like this one, but gray/brown:

Here's a closeup of the PC branding:

I borrowed the keyboard to see if it worked.
I was able to get it to function on my PC with an AT->PS/2 adapter for my native ps/2 port, but I couldn't get it to work through my usb adapter. Perhaps I need to try another one.
My adapter is an Adesso that identifies itself as
Bus 005 Device 002: ID 0518:0001 EzKEY Corp. USB to PS2 Adaptor v1.09
It looks like the same form factor and device as the Ez Smart Adapter Ez-PU21 in the
wiki.
Ez Smart Adapter Ez-PU21
VendorID: 0518
ProductID: 0001
This lunchbox PC/keyboard combo isn't mine, but the keyboard is awesome. The orange lettering on the brown keys is the bomb.
If anyone has more info on this type of computer and/or the keyboard it uses, I'd love to hear it.