Monocase/dualcase switch

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Provided by the ASK Keyboard Dictionary

Category: Components Origin: Official

Also known as: uppercase/mixed-case switch, blue switch, blue button

The monocase/dualcase switch is a rocker-style switch found on IBM 3104 and 3178 keyboards (31XX-75 and 31XX-87 type Model Fs, excluding the Japanese Katakana versions of such keyboards). It affects how the terminal displays alphabetic characters, which as its "A/A,a" label suggests, toggles between all-uppercase or uppercase and lowercase text.

Sources

ASK. Admiral Shark's Keyboards original content. License/note: CC BY-NC-SA 4.0.

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