Frederik Pohl 
The Knights of Arthur [EPUB ebook] 
With linked Table of Contents

Arthur made it alive through the Third World War. Well, if you can call a computer brain alive. He’s not much more than a suitcase and a typewriter, but he has skills, skills that a lot of people want and need in a post-apocalyptic world. So he and his friends are on the run. But is there anywhere safe for them to run to?