Most of the keys on the HP 9S calculator can perform more than one function. These are broken into two groups, first functions and second functions.
HP 9S Calculator - Using the Keyboard
Using the first functions
These are the functions that are indicated by the label on the key. Pressing the key without first pressing the 2ndF key performs them.
Using the second functions
These are the functions indicated by the label above the key. First pressing the 2ndF key, then pressing the key for the function performs them.
When the 2ndF key has been pressed, the 2ndF indicator is displayed to indicate the next time a key is pressed it will select the second function of that key.
If the 2ndF key is pressed by mistake, press 2ndF again to remove the 2ndF indicator from the display.
note:When in HEX mode, the letters used in hexadecimal representation (A, B, C, D, E, and F) are first functions. When in STAT mode the n, X, S, and DATA are also primary keys.
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