Note that with tbodt's excellent ish app (<a href="https://ish.app/" rel="nofollow">https://ish.app/</a>), you can get a <i>real</i> emacs installation on the iPhone. I made a quick writeup on it (<a href="https://dp12.github.io/posts/tippinglikeits1989" rel="nofollow">https://dp12.github.io/posts/tippinglikeits1989</a>).