Simulacron-3 was written by Daniel_F._Galouye and was published in January 1964. This means that he was likely writing Simulacron-3 throughout or at least part of 1963.
https://www.goodreads.com/book/show/5714811-simulacron-3
From an amazing book to a mind-blowing TV movie.
https://www.criterion.com/films/27742-world-on-a-wire
World on a Wire - U.S. Trailer (Rainer Werner Fassbinder, West Germany 1973) https://www.youtube.com/watch?v=URq7m3-SOtA
The virtual reality matrix of "World on a Wire" https://www.youtube.com/watch?v=1iGagrEfVj4
Eventually, part of the story would form the basis for, The 13th Floor movie.
Living in a Simulation with Neil deGrasse Tyson and Nick Bostrom https://www.youtube.com/watch?v=g2rJITW9viw , StarTalk
