Casio Fx-991es
#1 Guest_Sergei Frolov_*
Posted 02 October 2004 - 06:44 PM
#2 Guest_Guest_*
Posted 24 February 2005 - 01:52 PM
=)
#3
Posted 25 February 2005 - 10:36 PM
#4 Guest_Sergei Frolov_*
Posted 13 March 2005 - 01:19 PM
By the way, I may exchange the fx-991ES to some of Russian collectibles like Elektronika MK-51 (Russian copy of the Casio fx-2500) or Elektronika MK-52
#5 Guest_Guest_*
Posted 13 March 2005 - 02:43 PM
Will wait fx-991ES in our shops.
By the way, I may exchange the fx-991ES to some of Russian collectibles like Elektronika MK-51 (Russian copy of the Casio fx-2500) or Elektronika MK-52
It's on sale in Hong Kong selling at around US$17.69.
#6 Guest_Sergei Frolov_*
Posted 13 March 2005 - 07:04 PM
#7 Guest_Sergei Frolov_*
Posted 01 April 2005 - 08:41 AM
#8
Posted 12 April 2005 - 08:46 AM
I see has complex mode..Any formula memory?
Hi Sergei..I saw your site...very intersting...I didn't know that soviets made calculators on their own...
#9 Guest_Sergei Frolov_*
Posted 12 April 2005 - 09:03 AM
fx 82es? What model is this? Never seen before.
I see has complex mode..Any formula memory?
Hi Sergei..I saw your site...very intersting...I didn't know that soviets made calculators on their own...
fx-991ES. No formula memory (not programmable), it has not also engineering symbols like 'm', 'k', so you can't enter 3.4k * 5.6M.
Original fx-82ES has not complex mode.
#10
Posted 12 April 2005 - 09:16 AM
is it so difficult to leave old (and useful) functions in newer models????
I do not understand....
For Sergei: which calc model your image refers to???? fx991es or fx82es??? I can see CMPLX mode is present..
#11 Guest_Sergei Frolov_*
Posted 12 April 2005 - 09:41 AM
For Sergei: which calc model your image refers to???? fx991es or fx82es??? I can see CMPLX mode is present..
On the images you may see the fx-991ES functionality.
#12
Posted 12 April 2005 - 10:08 AM
The only difference I can find in fx 991es is the "natural display"...maybe they could also product a model fx570es, so we have perfect correspondance with past models...
#13 Guest_Sergei Frolov_*
Posted 12 April 2005 - 10:53 AM
http://ftp.casio.co....S_991ES_Eng.pdf
#14 Guest_Guest_*
Posted 12 April 2005 - 02:51 PM
#15 Guest_Sergei Frolov_*
Posted 12 April 2005 - 05:08 PM
#16 Guest_hk_*
Posted 17 June 2005 - 04:09 PM
#17 Guest_991ES_*
Posted 21 June 2005 - 05:54 AM
#18 Guest_Guest_*
Posted 02 July 2005 - 01:46 PM
#19
Posted 02 July 2005 - 06:40 PM
A teacher friend of mine comment that Singapore sort of disallowed this model because of the natural display..like sqrt(8) can be displayed as 2xsqrt(2) and also 2.828427...also Hong Kong too. Thats why if your countries is not selling it it is possible that the distributor knows it is not allowed for high school exam so they are not importing...
Verticale you said why not a bit of formula memory in the calculator...if that is so then the Casio scientific calculator would not be selling at all such features willl be consider programmable and many markets are not open to students using programmable calculator.
#20 Guest_to kaki_*
Posted 03 July 2005 - 01:47 PM
#21
Posted 04 July 2005 - 06:59 PM
If you understand german or have a good translator then try:
www.dynatech.de
I also think it has global shipping.
#22
Posted 16 July 2005 - 12:22 PM
ES serie has been available in Vietnam for months. My sister bough it at the price nearly 20 USD.
When I asked the seller, he said ES series is "harder to sell" than MS series. It is true that 99% of the students in my country use Casio calculator, and MS is at the top of purchasing. Vietnamese teachers don't allow using some type of calc like AFX or ClassPad (but I still have one, I just use it at normal class, not in exam ).
#23 Guest_alternative_*
Posted 19 July 2005 - 08:47 AM
so is there any other country or 'site' that offer this calculator, but the site is in english and ships to Australia.
#24
Posted 20 July 2005 - 01:51 AM
It seems to me that most of you like this new calculators. However, I think it is OK to by fx 570MS or fx 991MS. After a day borrowing fx 991ES from my sister and try using it, I found that it is not much different from fx 991MS. I was attracted because of its good design and ability to display natural format.
Here, I list something that fx991 ES does better:
1) Natural input.
2) Natural display (certainly not complex expression. Ex: pi; 12+4sqrt(2))...
3) Faster in calculating Integral, derivative, and can convert result to fraction (MS series cannot do it).
4) Table function.
5) Good menu design.
6) Better in numerical equation solving.
7) Easily in working with Matrix and Vector
Here are something that were missed
1) Engine display.
2) Cannot display natural format when solving quadratic, cubic equation (I mean when the result includes sqrt())
Well, it's up to you to decide what calc best suit, but I think you will not regret buying MS series.
#25
Posted 20 July 2005 - 08:24 AM
not to forget the ability of this ES to do logarithmic function calculation of other bases. For example now we can do log(5,2) at the calc and the four operation of log like log(5,17)+log(56,11) for example.
Another good point is that we can switch off the natural display and use the normal MS linear display. Hey come to think about it, it is like having 2 calculators in 1
#26 Guest_._*
Posted 20 July 2005 - 09:28 AM
#27 Guest_?_*
Posted 20 July 2005 - 09:33 AM
#28 Guest_Guest_*
Posted 19 January 2006 - 12:04 PM
'm an engineering student and this calculator meets my needs. I only regret it not having the handy engineering symbols. (Which i really, REALLY don't understand; (given that the calculator has 40 scientific constants, the engineering simbols could be EASILY introduced as scientific constants) )
#29 Guest_Sergei Frolov_*
Posted 19 January 2006 - 05:48 PM
Thanks for the info. I have purchased the fx-82ES and have upgraded it to the fx-991ES.
#30 Guest_Mr.M._*
Posted 11 February 2006 - 07:37 PM
Wow, how did you do that?Thanks for the info. I have purchased the fx-82ES and have upgraded it to the fx-991ES.
And maybe do you have a hint on this: Can i remove (or replace) CASIO logo when i turn off my fx-570ES ?
#31 Guest_E from CANADA_*
Posted 21 February 2007 - 09:57 PM
#32 Guest_TR_*
Posted 14 March 2007 - 11:49 AM
#33 Guest_Guest_*
Posted 22 August 2007 - 11:49 PM
#34 Guest_Jenab6_*
Posted 08 September 2008 - 03:22 PM
http://www.voidware....lcs/fx991es.htm
Apparently, the calculator redraws the screen after every key press, and as the expression being entered becomes long, it takes longer to redraw. If the user presses the next key before the redrawing from the previous press has completed, then it is possible that the expression will be incorrect after the next redraw.
#35
Posted 09 September 2008 - 03:51 AM
That is old news, calculators don't have a keyboard buffer like computers do.
Every now and then Casio is smeared by someone for not having a keyboard buffer. Especially the Texas Instruments crowd is always in a hurry to find anything wrong with a Casio that beats their models hands down in functionality, beauty and user friendliness.
A few years ago in the Washington Post there was an article about "Casio giving wrong results" they took a real simple non-scientific Casio, I forgot the model, pressed "2 x 2 x 2 =" real fast and instead of "8" the answer was ... "16".
Between the lines it said, stay away from the jap crap, better buy a good american Texas Instruments.
What happens (and the article did not bother explaining): as soon as you press the second "x" the Caiso will calculate the first "2 x 2" and this takes a bit of time. During the calculation, the third "2" is pressed and the calculator doesn't catch it, because it's busy. Then, when the answer is there ("4") and "=" is pressed, the calculator thinks it has to multiply "4 x 4" and does such correctly.
Well guess what, I bought a Texas Instruments TI-1726 (my one and only TI, wasted $3.50 on it) and it does exactly the same: "2 x 2 x 2 =" not even that fast, and it says "16"....
#36 Guest_anu_*
Posted 20 February 2009 - 02:27 PM
yea.. i've been trying to find FX-991ES in HK . can anyone tell me where in hk, kowloon.. address would be great..?
you can buy it very easily from any UK store. I bought it and its a very useful tool
#37 Guest_TvojaMatka_*
Posted 28 February 2009 - 09:55 PM
has it most function for my study or i must buy expensivest calc ?
thx
#38 Guest_shiva_*
Posted 13 May 2010 - 01:57 AM
Hi you can buy FX991ES in Montreal Canada for $28.89oh, i so want this calculator... So which countries or sites offer this calculator besides germany and vietnam ?
#39
Posted 13 May 2010 - 07:12 AM
Don't waste your money buying this calculator.hi, i want to buy calc for my study - electro university... i need complex num. andI read that is bad "support" that function... also it doesnt known complex matrices, or matrices with 4variables (lines?) or more...
has it most function for my study or i must buy expensivest calc ?
thx
1) It's buggy. It makes error in conversion between rational<->fractional results. Default answer mode in "natural mode" is fractional.
2) It's buggy in simple complex number calculations e.g. i^4 results to the math error...
3) Work with this calculator is very slow as useful operations are deeply hidden in submenus and every real work with this "feature" is really slowwwww.
4) It can't work with complex numbers in matrices.
5) Matrix implementation is very simple and work is very slow see 3)
I think that this calculator is useful for a primary school, useless or even "danger" for Electrical Engineering...
Buy at least Casio Fx9860G. With the latest downloadable firmware 2.0 it can very comfortably work with complex matrices
#40
Posted 15 April 2014 - 01:16 PM
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