How about a Psion netBook or Netpad. As he's an author it would be a better typing experience than a PDA even with the mini keyboards you can get for them. The connection to PC is serial though rather than USB.
Huawei MateBook X Pro review: Hands-on
The art of 'British' pulp fiction
Best password managers for Mac
TV & streaming : comment regarder le Tournoi des Six Nations 2018 ?