FYI Byron Rakitzis (of posix rc fame) produced a version popi with the JIT compiler, though sadly his where for cpus which are common cpus these days.
Also possibly of interest is the paper from the 10th edition manual http://plan9.bell-labs.com/10thEdMan/pico.pdf And a few fun pictures that where generated http://plan9.bell-labs.com/10thEdMan/v2pix.html -Steve
