Marooned in Realtime is a 1986 novel by Vernor Vinge. It is about the aftermath of Technological Singularity which was a very new concept way back then.
I have two copies. The 1987 Pan Paperback, pictured above and a Doubleday Bookclub Hardcover titled "Across Realtime" that inlcudes both The Peace War and Marooned in Realtime.
Wayne's Rating: 10/10.