Images don't seem to be cached indeed. They never work in a cached article, but also when trying to google for "cache:http://inertiawar.com/microcode/fig-1-1.png " it says they're not cached.
Edit: HN bug? The double-quote sign behind the URL in this post disappears when I don't put a space in between.
Edit: HN bug? The double-quote sign behind the URL in this post disappears when I don't put a space in between.