Section 3: Automatic Memory Stack and ALPHA Register42
When the calculator is in normal mode, by pressing g CLX (clear X) clears the X-register and display to zeros.
For example, the stack (automatic memory stack) now looks like this (with data intact from the previous example):
  T  0.0000    
  Z  0.0000    
  Y  0.0000    
  X  0.2000   (Displayed)
Pressing g CLX now clears the X-register (display). Notice that the function name CLX appears when you press and hold CLX for a moment.
Keystrokes Display    
g CLX   CLX   When you press and hold the key for
   0.0000   a moment, the function name appears in the display.
  T  0.0000    
  Z  0.0000    
  Y  0.0000    
  X  0.0000   (Displayed)
Editing Display Entries
The    (correction) function lets you ‘‘back up’’ when you have made an error. Simply stated, any time you make an error and you want to remove numbers of ALPHA characters (ALPHAs) you keyed in, or numbers left by a function, press    .
If the _ (underscore) prompt follows any ALPHA string or number in the display, you can delete one character or digit at a time from that string or number by pressing    . If the _ prompt does not follow the displayed ALPHA string or number, pressing    clears the display.
While you are keying in numbers in normal mode, pressing    deletes one right-most number at a time.    clears the display to zeros if you delete all of the numbers in the display.
For example, key in a number, edit it, and then delete it entirely using    . Note the movement of the _ prompt.