Neuromancer is a computer adventure game created by Interplay Productions in 1988 and distributed by Mediagenic (a brand name that Activision was also known by). It was designed by Bruce Balfour, Michael Stackpole, Brian Fargo, and by Troy A. Miles, who was also responsible for the programming.You might be able to download it here.
It is based loosely on the William Gibson novel of the same name and takes place in both the "real world" and the extensively realized and detailed world of cyberspace. It is also noted for having a soundtrack based on the Devo song "Some Things Never Change". The gaming rights at the time were owned by Timothy Leary, who brought the project to Interplay to develop.