HP35s: unexpected behaviour with LASTx

11202015, 07:05 PM
(This post was last modified: 11202015 07:19 PM by Dieter.)
Post: #1




HP35s: unexpected behaviour with LASTx
Some time ago I found a somewhat strange behaviour of my 35s with LastX and Pi.
Maybe you can try this: Code: 2 [ENTER] 5 [x] 10,0000 So far, so good. After the first multiplication LASTx was set to the last factor 5, so the second calculation returned 3x5 = 15. Now do the same with Pi instead of 3. Code: 2 [ENTER] 5 [x] 10,0000 After pressing [LASTx] not the expected 5 appears, but the last result 10. It actually looks like pressing the [π] key causes the current X to become the new LASTx. So the result is not the expected 5π but 10π. You may even try this: Code: [CLSTK] [x] 0,0000 clears the complete stack including LastX BTW this does not seem to happen with other constants, e.g. in the first example, [e] [LASTx] [x] returns e*5 = 13,5914. Any ideas what's going on here? May this be a firmware bug that sets LASTx when π is entered? The 35s seems to behave as if π was a function π(x). Dieter 

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