The Amdek Video 310A twelve-inch cathode ray tube monochrome display monitor accompanied a 1985 PC’s Limited Turbo PC (2007.0042.01). Monochrome monitors only have the ability to display text in one color. The shade of the text depends on the type of phosphor used in the cathode ray tube. The Amdek 310A contained P3 phosphor, displaying amber characters on the screen.
Amdek Corporation, Model 310/310A Owner’s Manual, 1984.