Hp 48s User Manual -

Press the orange left-arrow key first to access the orange-labeled commands above the keys.

Press and hold [ON] and [C] simultaneously, then release. This interrupts hung operations without deleting stored data.

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If the calculator locks up or displays memory errors, use these commands:

One of the best features of the HP 48S is its built-in unit conversion and unit math. Press [Orange Shift] and [UNITS] .

The HP 48S uses RPN by default. Instead of entering operators between numbers, you enter the numbers first and then the operator. There is no equals ( Press [5] , [ENTER] , [3] , [+] . The Stack: Numbers push custom levels up the display ( , etc.). Operators act on the bottom levels. 2. Primary Key Colors and Shift Keys White Labels: Primary functions printed on the keys.