NY Daily News has this feature on Terry Pratchett, whose Alzheimer’s is worsening. “I used to touch type as fast as any journalist does and my spelling was pretty good. Now I hunt and peg and my spelling is erratic,” he told The Times of London. “I can spell ‘transubstantiation’ and in the next bit I can’t spell ‘color’ because it’s as if bits of the network are switching on and off.”
He says he will to write, just “more carefully.”
Sorry to hear he’s losing a step, but on the basis of “Feet of Clay”,”Night Watch”, and “Thud!”, it’s safe to say that it’s a step most other writers never even had.