The NES version is my favorite 8-bits game. Such mind blowing to have 3D graphics on this console. The manual referred to rock hermit, I spent many hours searching for them, without encountering any... I remembered discovering by accident how to escape hyperdrive and be assaulted by Thargoids. What a game!
Document source files is on GitHub [1].
[1]: https://github.com/markmoxon/nes-elite-beebasm