Don't know is there is a misunderstanding here, but uemacs is completely independent from emacs, it's just a very efficient and very small editor that offers the same basic key bindings. The whole installation takes hardly more than 200kB, and beyond libc, the only libraries reported by ldd are libncurses and libtinfo. It is even much smaller than nano. GNU emacs started in 1984, and I remember using some early microemacs version essentially at the same time - they were probably developed in parallel.