From the science fiction author's Wikipedia entry:
In 1987 Disch collaborated with New Jersey software company Cognetics Corp. and games publisher Electronic Arts to create the interactive fiction text adventure Amnesia, which could be played on the Commodore 64, IBM PC or Apple II computers. The title, based on technology pioneered by Cognetics' Charles Kreitzberg, was produced by Don Daglow and programmed by Kevin Bentley. It showcased Disch's vivid writing, a stark contrast to other game-programmer-written text adventures of the time, and his passion for the energy of the city of New York. Although the text adventure format was dying by the time Amnesia was released and it enjoyed limited success, the game pioneered ideas that would later become popular in game design by modeling the entire Manhattan street map south of 110th St. and allowing the player to visit any street corner in that part of the city in their quest to advance the story. Although the limited floppy disk capacity of the 1980s computers caused much of Disch's original text about the city to be cut, many Manhattan sites and people were described with unique loving distortion through the Disch lens.
This explains (or at least backgrounds) the virtual world "Wyomia" in Disch's 1991 horror novel The MD. From childhood the evil protagonist spends his spare time building a personal world of torture and murder that grows increasingly baroque as he ages. Disch is in cyberspace himself, '00s style--just discovered a LiveJournal where he publishes mostly verse. Disch's sf culturecrit memoir The Dreams Our Stuff Is Made Of is a great read.