The HP70 and it's limitations.

01262018, 09:43 PM
Post: #1




The HP70 and it's limitations.
Have you ever tried to calculate the square root on an HP 70? First you realise "oh, there is no sqrt key!". Then you think "ah, there is y^x". So you type a 2 and go in search of thea 1/X key. But you can't find it. So you hit enter, 1, /, y^x and finally get a result. But oh no... you pushed something off the stack... then you start wondering:
Ok, admittedly the HP 70 was never intended for engineering use, maybe there is no need for sqrt. But 1/X?!? Is that really never needed by financial people? Any thoughts? I am still wondering... Cheers, Harald 

01262018, 10:08 PM
(This post was last modified: 01262018 10:09 PM by SlideRule.)
Post: #2




RE: The HP70 and it's limitations.
Perhaps
4; Enter; 0.5; Y^x or 4, Enter, 1, Enter, 2, /, Y^x etc. SlideRule am I missing something? 

01262018, 10:08 PM
Post: #3




RE: The HP70 and it's limitations.  
01262018, 10:47 PM
Post: #4




RE: The HP70 and it's limitations.
(01262018 10:08 PM)SlideRule Wrote: Perhaps You are not missing anything, it is all there. It is just that I forgot about square root not being available. So my next thought was y^(1/2). I usually prefer entering 0.5 as 2 1/X, don't ask me why, I don't know. And in attempting that I forgot 1/X isn't there either. Both sqrt and 1/X are functions I use a lot. So it always surprises me they have been left of the HP 70. 

01262018, 10:50 PM
Post: #5




RE: The HP70 and it's limitations.
(01262018 10:08 PM)Maximilian Hohmann Wrote:(01262018 09:43 PM)Harald Wrote: Any thoughts? I am still wondering... I would have tried ln 2 / e^x, but ln and e^x aren't there either. Still, I am glad I have a 70 

01272018, 12:50 AM
Post: #6




RE: The HP70 and it's limitations.
Get a Victor V12. It’s all there, and RPN too.


01272018, 02:43 AM
Post: #7




RE: The HP70 and it's limitations.
The HP70 Manual, page 27, says to use 25 ENTER 1 ENTER 2 [÷] [y^x] to get the square root of 25.
<0ɸ0> Joe 

01272018, 12:20 PM
Post: #8




RE: The HP70 and it's limitations.
(01262018 10:50 PM)Harald Wrote: Still, I am glad I have a 70 Me too. One of the real difficult ones to find. By the way: Its "big brother", the HP80 does not have sqrt and reciprocal either. And the HP22 has sqrt but no 1/x. The first HP financial calculator which has them both must be the HP27 (which is not a pure financial calculator) and the HP37. 

01272018, 02:07 PM
(This post was last modified: 01272018 02:10 PM by Massimo Gnerucci.)
Post: #9




RE: The HP70 and it's limitations.
(01272018 12:20 PM)Maximilian Hohmann Wrote:(01262018 10:50 PM)Harald Wrote: Still, I am glad I have a 70 Another one with a 70 The HP80 does have sqrt (shift y^x). Greetings, Massimo +×÷ ↔ left is right and right is wrong 

01272018, 02:43 PM
Post: #10




RE: The HP70 and it's limitations.
(01262018 10:50 PM)Harald Wrote: Still, I am glad I have a 70 Me too! Of all the machines I've acquired that are too disappointing to use, this one made me the happiest. The limited feature set (compared to HP80) is clearly why this machine was not popular, did not sell well and was quickly discontinued. The garish color scheme and unusual keyboard layout (CLX on bottom right!?!?!) surely didn't help either. Still, I too am glad I have a 70! It's endearing in an ugly child kinda way. Bob Prosperi 

01272018, 03:21 PM
Post: #11




RE: The HP70 and it's limitations.  
01272018, 06:33 PM
(This post was last modified: 02042018 05:23 PM by aurelio.)
Post: #12




RE: The HP70 and it's limitations.  
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