The RGB blue box turns your PC`s RGB-monitor screen blue at the flip of a switch. That is, it makes your computer display bright white text on a blue background, instead of the usual low-intensity white on black. The RGB .blue box connects between your IBM PC color graphics adapter, or equivalent, and your RGB color monitor. By flipping a switch, you choose between two modes. One mode passes the signal from the PC to the monitor unaltered; the other transforms it to make text more readable.
Rgb-blue-box - schematic

The monitor has four TTL-level inputs-red, green, blue, and intensity-and it interprets disconnected wires as on. That"s why the screen turns white if you disconnect the monitor from the computer, and blue if you disconnect only the blue line. Instead of just discarding the blue signal, the blue box reroutes it to the intensity input. As a result, most of the text colors come out intensified.

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