Meh, I never gave it much thought as this kind of stuff is outside of my interests. I don't really pay much attention to system software before System 6.

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Yah, Linus went back in time with the codebase for KDE to create an embedded-type GNU/Linux with KDE which runs in 128k.

It makes sense - if you look at the size of Linux (the kernel) and KDE, then extrapolate backwards, it'd probably require going all the way back to 1984 in order for the codebase to shrink enough to run in 128k.