Clearing Memory - HP 33s User Manual

Clearing Memory

The usual way to clear user memory is to press
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
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
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
Å
key.
#
.
CLEAR ALL
Unchanged
Unchanged
Unchanged
Unchanged
Unchanged
Unchanged
Unchanged
Unchanged
Unchanged
EQN LIST TOP
Cleared
Null
PRGM TOP
Cleared
Enabled
Cleared to zero
Cleared to zero
User Memory and the Stack
¹ ¡
{  }. However,
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
B–3