HP 33s - Manual (Page 197)

Programming Techniques 13–13
Program Lines:
(In RPN mode)
Description:
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Clears flag 0, the indicator for In X.
   Clears flag 1, the indicator for In Y.
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Sets flag 0, the indicator for In X.

   Clears flag 1, the indicator for In Y.
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Clears flag 0, the indicator for In X.

   Sets flag 1, the indicator for In Y.
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Sets flag 0, the indicator for ln X.
   Sets flag 1, the indicator for In Y.
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$
 @
If flag 0 is set ...
$
 ... takes the natural log of the X–input.
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$

 @  If flag 1 is set ...
$
  ... takes the natural log of the Y–input.
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