IBM Computer History: Mainframes: The following was painfully rescued from an ancient VHS tape, and enhanced to increase viewability. It provides a look at IBM promotional computer developments up to about 1970. Many early machines are touched on very briefly, ending with a mention of an IBM customer information and control system used by Houston Lighting & Power Company, as well as other material. Video quality is somewhat poor. Historical value rests mostly with the original audio narrator Norman Rose. Worth sharing for those who love early IBM history. Hope you enjoy. Film segment courtesy of IBM Archives. Runs 20 minutes. Computer History Archives Project.