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Section 5: The Display and Continuous Memory
Low-Power Indication
When a flashing asterisk, which indicates
low battery power, appears in the lower
left-hand side of the display, there is no
reason to panic. You still have plenty of
calculator time remaining: at least 10
minutes if you continuously run programs,
and at least an hour if you do calculations
manually. Refer to appendix F (page 259)
for information on replacing the batteries.
Continuous Memory
Status
The Continuous Memory feature of the HP-15C retains the following in the
calculator, even when the display is turned off:
All numeric data stored in the calculator.
All programs stored in the calculator.
Position of the calculator in program memory.
Display mode and setting.
Trigonometric mode (Degrees, Radians, or Grads).
Any pending subroutine returns.
Flag settings (except flag 9, which clears when the display is
manually turned off).
User mode setting.
Complex mode setting.
When the HP-15C is turned on, it always ―wakes up‖ in Run mode. If the
calculator is turned off, Continuous Memory will be preserved for a short
period while the batteries are removed. Data and programs are preserved
longer than other aspects of calculator status. Refer to appendix F for
instructions on changing batteries.
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