Clearing the HP10BII Calculator
To clear the HP10BII calculator’s memory, press [gold shift] [C ALL].
If we did not press, we would input the data shown on the screen to memory. Clearing the calculator is very important, since unwanted data in memory can result in improper calculations, and hence wrong answers. It is best to get into the habit of automatically clearing memory before starting a calculation. Occasionally, you may purposely want to save data, but, in general, you will be entering all new data, so starting with a clear memory is the safest approach.
There are three different levels of clearing data:
C ALL clears all memory and the display.
C clears the entire display, but not the memory.
< (backspace) clears numbers on the display one at a time if you made a mistake entering data