HP Forum Archive 18

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The HP 20b RPN Arcus Cosine Bug Message #1 Posted by Marcus von Cube, Germany on 17 Sept 2008, 8:19 a.m. As I have already stated in the "First Impressions" thread, the HP 20b has a strange bug. I did some research and could narrow down the circumstances: 1) Select RPN mode 2) Select radian mode 3) Clear the stack (just to make things easier to check out) 4) Enter 1 +/- 5) Select Math/trig and scroll to COS-1 6) Press input Now, the rounded value of PI is in the display and the argument -1 is in stacklevel Y. You can check it with swap ")" or roll down "(". This is the only situation I could spot where the argument is not popped off the stack but pushed to Y. In degree mode, the bug is not present. Marcus Edited: 17 Sept 2008, 8:22 a.m.

Re: The HP 20b RPN Arcus Cosine Bug Message #2 Posted by cyrille de Brebisson on 17 Sept 2008, 9:21 a.m., in response to message #1 by Marcus von Cube, Germany thanks, I will look at it.

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