From previous interviews I have seen him say his process for writing those books was to hand write them for the first draft and then transcribe them into emacs

From previous interviews I have seen him say his process for writing those books was to hand write them for the first draft and then transcribe them into emacs as part of the editing process. Seems pretty sensible to me; get the thoughts on the page without an easy way to fuss over the exact prose, and then labour over the exact structure and phrasing later.