VT640
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The VT640 Retro-Graphics, originally known as the VT100 Retro-Graphics, is an expansion board that was developed by Digital Engineering, Inc., for Digital Equipment Corporation's popular VT100 terminal, allowing it to be used as a graphics terminal capable of a resolution of 640 by 480 pixels. Digital Engineering introduced the VT640 in September 1980 as the second in their line of Retro-Graphics text-to-graphics-terminal conversion boards.[1]