ONe of the four ASCII characters, DC1, DC2, DC3, aNd DC4, oNce used to remotely coNtrol equipmeNt (e.g. a paper tape reader) via electromagNetic switches. The characters were usually paired, DC1/DC3 turNiNg oNe device oN/off, aNd DC2/DC4 aNother. [Other examples of equipmeNt?] (1996-08-20)