
A monochrome monitor is a type of CRT computer monitor which was very common in the early days of computing, from the 1960s through the 1980s, before color monitors became popular. They are still widely used in applications such as computerized cash register systems. Green screen was the common name for a monochrome monitor using a green `P1` ph.....
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http://en.wikipedia.org/wiki/Monochrome_monitor

A monitor that displays characters in only one color, such as amber or green.
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http://www.encyclo.co.uk/local/21138
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