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HP 9S Calculator - Resetting the Calculator
The instructions below explain how to restore the HP 9S calculator to normal operation.
If there is an overflow or error indicator on the display of the calculator, clear it by pressing the ON/C key.
If the calculator locks up, and pressing keys has no effect, press M+ and ENG at the same time. This unlocks the calculator and returns all settings to their default values.
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Country: United States