It takes some trial and error to get linux on a 1400, but it most certainly can be done.  I have a pair of 1400's here that used to boot linux.  I did it as a novelty really, but the last Apple distribution of MKlinux works with a few patched files that I found on sourceforge and a patched loader.

I originally wanted to tinker with linux since I could not get my ancient WaveLAN card to function properly under any other system then 8.6, which was too heavy for the 40M of ram, so I figured that a stripped-down Linux build would run faster... but I have since gotten the card working 100% under 7.6.1, so I ditched the linux idea since it runs adequately fast on bothgh my 117mHz/16Meg machine and my 166mHz/40Meg machine.