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Full Version: 12 C Q (comma vs decimal)
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I have a comma on my HP 12 C instead of a decimal point.
How do I correct this?

From the museum FAQ:

Help! My HP-10C series calculator has commas and points switched!
This is a feature that allows the calculator to display numbers correctly around the world. To toggle the feature, start with the calculator off. Press and hold the ON key, press and hold the '.' key, release the ON key then release the '.' key. It is amazing how often small children are able to find this sequence on their parent's calculators