Silver Paint Keys; Backspacing And Clearing - HP 33s User Manual

Silver Paint Keys

Those eight silver paint keys have their specific pressure points marked in blue
position in the illustration below.
To use those keys, make sure to press down the corresponding position for the
desired function.

Backspacing and Clearing

One of the first things you need to know is how to clear: how to correct numbers,
clear the display, or start over.
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Getting Started