Abstract: A color converter circuit particularly suited for use with computer-steered multi-color display units accepts at its input terminals a plurality of color commands from the associated computer or other signal source, and includes manual selection means for selecting a corresponding plurality of different output color commands to be actuated selectively upon response of each different input color command to provide manual control of the colors of the generated pattern, without requiring software modification. Associated indicator lights adjacent each of the color-selecting switches indicate which colors in the form of color commands are being sent from the computer. A simplified version of the converter accepts monochrome commands capable of giving only dark and bright commands from the computer, and selectively provides optionally chosen different color commands to the display unit to correspond to each of the two input signal conditions.