Storing zero into any register clears that register. The following keys are used to clear groups of registers:
or clears the x, y, z, t, and last x registers. This is also referred to as clearing the stack and should be performed before starting a new set of calculations. This operation also returns the current input method to the setting specified in the Preferences dialog.
or clears the x register. This should be used when an incorrect number has been entered and you'd like to start entering the number again.
or clears or resets all registers, clears the keyboard macro, and resets the calculator state. It does not modify the settings in the Preferences dialog.
clears the user, financial, and statistical registers.
clears the financial registers and displays the number of compounding periods per year. This function also clears any user registers that currently contain a cash flow entry, leaving all other user registers unmodified.
clears the statistical registers used to hold a summary of the entered data values.
resets the date conversion registers to their default values (except ) and displays the number of frames per second.
or 
clears the x, y, z, t, and last x registers. This is also referred to as clearing the stack and should be performed before starting a new set of calculations. This operation also returns the current input method to the setting specified in the Preferences dialog.
or 
clears the x register. This should be used when an incorrect number has been entered and you'd like to start entering the number again.
or 
clears or resets all registers, clears the keyboard macro, and resets the calculator state. It does not modify the settings in the Preferences dialog.
clears the user, financial, and statistical registers.
clears the financial registers and displays the number of compounding periods per year. This function also clears any user registers that currently contain a cash flow entry, leaving all other user registers unmodified.
clears the statistical registers used to hold a summary of the entered data values.
resets the date conversion registers to their default values (except 
) and displays the number of frames per second.