Monochrome monitor

A monochrome monitor is a display device that is capable of showing images and text in only one color, typically against a contrasting background. The term "monochrome" means "single color," so such monitors can produce output in various shades of a single color, predominantly black on a white background or vice versa. Historically, monochrome monitors were common in early computing systems, such as DOS-based machines and early computer graphics systems.