You could unplug it from the computer (it was a mini-din PS/2 style plug). The keyboard itself wasn't mechanical (not a buckling spring or similar system), but it did have full-travel keys and a nice feel for typing on.
I got mine used and had to build a custom battery pack from old cell phone batteries, which made me have to remove 2 meg of RAM (to fit the larger custom battery pack), leaving me with 6 meg instead of 8. I had Caldera OpenDOS installed on it:
http://www.deltasoft.com/opendos.htm
http://esca.atomki.hu/paradise/dos/opendos-en.html
https://en.wikipedia.org/wiki/DR-DOS
...with Monkey Linux installed on top of that (Monkey is a distro that used DOS for the underlying file system - you could even share data easily):
http://projectdevolve.tripod.com/ (downloads don't work)
http://www.ipt.ntnu.no/~knutb/linux486/download/monkey/monke...
I'm honestly not sure where or if you can still get a copy of that distro - I should look into it; maybe I should host my copy somewhere...
But even these have gone away, to be replaced by the shitty island keys.
Luckily, this laptop can play x265 1080p video just fine and has 16GB of memory, but 4k is a no-go.