Re: HP 20b: +/- and ANS (or CHS and LASTx) Message #2 Posted by valentino ducati on 26 Dec 2008, 7:24 p.m., in response to message #1 by Thomas Klemm
Prologue
Despite the fact the 20b has a RPN mode, it has a strange "new" behaviour, contrary to the also new 35s and the dozens of classic hp RPN calculators:
ENTER after numeric keystrokes doesn't copy X to Y but it does only finalize the input buffer (it isn't X) and copy it to the 1st stack register in 20s.
Incredible, but it works like the high end RPL models. I don't know why they choose to change this important detail of RPN input paradigma...
Back to topic: That's why there is one more INPUT keystroke in my proposition below.
Possible solution
3,4567 INPUT
INPUT
shift SQR
2 ANS
shift LN
x
+
X<>Y
shift 1/x
-
20 keystrokes and right answer: 4,05
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