HP 300s Scientific Calculator - Manual (Page 31)

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• Note that calculation history memory contents are cleared
whenever you turn off the calculator, press the  key,
change to the calculation mode or the input/output format,
or perform any reset operation.
• Calculation history memory is limited. When the calculation
you are performing causes history memory to become full,
the oldest calculation is deleted automatically to make
room for the new calculation.
Replay Function
While a calculation result is on display, you can press  and
then  or  to edit the expression you used for the
previous calculation. If you are using Linear format, you can
display the expression by pressing
 or  , without
pressing  first.
Example: 4 ✕ 3 + 2.5 = 14.5
4 ✕ 3 - 7.1 = 4.9
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