HP 33s hp 33s_user's manual_English_E_HDPM20PIE56.pdf - Page 307

Clearing Memory The usual way to clear user memory is to press { c {}. However, there is also a more powerful clearing procedure that resets additional information and is useful if the keyboard is not functioning properly. If the calculator fails to respond to keystrokes, and you are unable to restore operation by resetting it or changing the batteries, try the following MEMORY CLEAR procedure. These keystrokes clear all of memory, reset the calculator, and restore all format and modes to their original, default settings (shown below): 1. Press and hold down the ‡ key. 2. Press and hold down . 3. Press . (You will be pressing three keys simultaneously). When you release all three keys, the display shows if the operation is successful. Category CLEAR ALL Angular mode Base mode Contrast setting Decimal point Denominator (/c value) Display format Flags Fraction-display mode Random-number seed Equation pointer Equation list FN = label Program pointer Program memory Stack lift Stack registers Variables Unchanged Unchanged Unchanged Unchanged Unchanged Unchanged Unchanged Unchanged Unchanged EQN LIST TOP Cleared Null PRGM TOP Cleared Enabled Cleared to zero Cleared to zero MEMORY CLEAR (Default) Degrees Decimal Medium ")" 4095 FIX 4 Cleared Off Zero EQN LIST TOP Cleared Null PRGM TOP Cleared Enabled Cleared to zero Cleared to zero User Memory and the Stack B-3