Monocase/dualcase switch

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Provided by the ASK Keyboard Dictionary

Category: Components

Origin: Official

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

The monocase/dualcase switch is a blue-coloured rocker-style switch found across various IBM 3270 family terminals. 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. It was originally introduced for the IBM 3276 and 3278 Display Stations, mounted to the right of their CRT. But for the IBM 3104 Display Terminal and 3178 Display Station, the switch was migrated to their Model F based keyboards (31XX-75 and 31XX-87 type, excluding their Japanese (Katakana) versions) and are a staple feature of them.

Sources

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

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