Try some of these:
Michael Benedikt, ed., Cyberspace: First Steps (Cambridge, Mass.: 1991).
Cynthia Goodman, Digital Visions: Computers and Art, (New York: 1987).
Friedrich Kittler, Discourse Networks (Stanford, 1990).
Jasia Reichardt, The Computer in Art (London: 1971).
Gene Youngblood, Expanded Cinema (New York: Dulton, 1970).
You might also find http://prehysteries.blogspot.com/ of interest (some good archive posts about history of new media and new media art).
