HP 33s Scientific manual Clearing Memory, Category, Default

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	MEMORY CLEAR
		(Default)
Angular mode	Unchanged	Degrees
Base mode	Unchanged	Decimal
Contrast setting	Unchanged	Medium
Decimal point	Unchanged	")"
Denominator (/c value)	Unchanged	4095
Display format	Unchanged	FIX 4
Flags	Unchanged	Cleared
Fraction–display mode	Unchanged	Off
Random–number seed	Unchanged	Zero
Equation pointer	EQN LIST TOP	EQN LIST TOP
Equation list	Cleared	Cleared
FN = label	Null	Null
Program pointer	PRGM TOP	PRGM TOP
Program memory	Cleared	Cleared
Stack lift	Enabled	Enabled
Stack registers	Cleared to zero	Cleared to zero
Variables	Cleared to zero	Cleared to zero

User Memory and the Stack B–3