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+--- Thread: The HP70 and it's limitations. (/thread-10027.html)
The HP70 and it's limitations. - Harald - 01-26-2018 09:43 PM
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
RE: The HP70 and it's limitations. - SlideRule - 01-26-2018 10:08 PM
Perhaps
4; Enter; 0.5; Y^x
or
4, Enter, 1, Enter, 2, /, Y^x
etc.
SlideRule
am I missing something?
RE: The HP70 and it's limitations. - Maximilian Hohmann - 01-26-2018 10:08 PM
(01-26-2018 09:43 PM)Harald Wrote: Any thoughts? I am still wondering...
It's all there: 1/x = y^-1 and sqrt = y^.5 :-)
BTW: There are contemporary financial calculators like this Victor V14 which do not even have y^x. It's either financial or nothing...
![[Image: A3M6_1_20131120333537616.jpg]](https://images10.newegg.com/NeweggImage/ProductImage/A3M6_1_20131120333537616.jpg)
RE: The HP70 and it's limitations. - Harald - 01-26-2018 10:47 PM
(01-26-2018 10:08 PM)SlideRule Wrote: Perhaps
4; Enter; 0.5; Y^x
or
4, Enter, 1, Enter, 2, /, Y^x
etc.
SlideRule
am I missing something?
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.
RE: The HP70 and it's limitations. - Harald - 01-26-2018 10:50 PM
(01-26-2018 10:08 PM)Maximilian Hohmann Wrote:(01-26-2018 09:43 PM)Harald Wrote: Any thoughts? I am still wondering...
It's all there: 1/x = y^-1 and sqrt = y^.5 :-)
BTW: There are contemporary financial calculators like this Victor V14 which do not even have y^x. It's either financial or nothing...
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
RE: The HP70 and it's limitations. - Michael de Estrada - 01-27-2018 12:50 AM
Get a Victor V12. It’s all there, and RPN too.
RE: The HP70 and it's limitations. - Joe Horn - 01-27-2018 02:43 AM
The HP-70 Manual, page 27, says to use 25 ENTER 1 ENTER 2 [÷] [y^x] to get the square root of 25.
RE: The HP70 and it's limitations. - Maximilian Hohmann - 01-27-2018 12:20 PM
(01-26-2018 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 HP-80 does not have sqrt and reciprocal either. And the HP-22 has sqrt but no 1/x. The first HP financial calculator which has them both must be the HP-27 (which is not a pure financial calculator) and the HP-37.
RE: The HP70 and it's limitations. - Massimo Gnerucci - 01-27-2018 02:07 PM
(01-27-2018 12:20 PM)Maximilian Hohmann Wrote:(01-26-2018 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 HP-80 does not have sqrt and reciprocal either. And the HP-22 has sqrt but no 1/x. The first HP financial calculator which has them both must be the HP-27 (which is not a pure financial calculator) and the HP-37.
Another one with a 70
The HP-80 does have sqrt (shift y^x).
RE: The HP70 and it's limitations. - rprosperi - 01-27-2018 02:43 PM
(01-26-2018 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 HP-80) 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.
RE: The HP70 and it's limitations. - Michael de Estrada - 01-27-2018 03:21 PM
(01-27-2018 12:20 PM)Maximilian Hohmann Wrote: By the way: Its "big brother", the HP-80 does not have sqrt and reciprocal either.
Incorrect. The HP-80 does have the sqrt function (yellow shift y^x), so it does not require the reciprocal operation to compute a square root.
RE: The HP70 and it's limitations. - aurelio - 01-27-2018 06:33 PM
anyway one of the most beatiful calculators ever made, the orange colour of the keyboard in lovely contrast with the military green/grey of the body
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![[Image: IMG_20180128_221207%20FILEminimizer.jpg]](http://s1125.photobucket.com/user/aury4/media/IMG_20180128_221207%20FILEminimizer.jpg.html)
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