Neuromancer was written between 1981 and 1984. The personal computers that existed at that time were poorly suited to writing; using one to write a novel would have been a deliberate and rather unusual choice.
(Consider, for example, that the first chapter of Neuromancer alone would have exceeded the stock memory capacity of many personal computers at the time, at ~46 kB.)
(Consider, for example, that the first chapter of Neuromancer alone would have exceeded the stock memory capacity of many personal computers at the time, at ~46 kB.)