# Req: Casio Fx 991 Es Newbie - Help Please!

### #1

Posted 18 January 2010 - 08:28 PM

Have just purchased a Casio fx 991 ES.

It looks like a great machine which will do everything that I'll ever need and more; however my last scientific calculator was from the 1980s (It was also a Casio!). I'm more familiar with this older style of data entry/display, and wonder if it is possible to get the fx 991 ES to operate in this mode by default.

Specifically:

1) How do I set the calculator so that it defaults to displaying fractions as decimals (expanding to exponential or scientific notation if the capacity of the display is exceeded) instead of expressing these as fractions?

2) Is it possible to get the calculator to default to parse the sequence of commands in the "old style" used by 1980s calculators (which I'm more familiar with) rather than the more modern "user friendly/natural" sequence installed by default.

2) I can't find a "+/-" button to toggle the result of a calculation to its "complement" or "negative" form.

I'm sure it must be there somewhere! How do I do this?

e.g. to change "9" to "-9" I would normally press the sequence "9" "+/-" during the calculation.

I've found a "(-)" button, but this must be pressed BEFORE the digit is entered to get the negative.

Is there a way to toggle the sign of a digit AFTER it has been entered or calculated?

3) I've so far only managed to find only one Memory which can be accessed/recalled during calculations. Are there more memories available which can be used simultaneously?

Apologies for any dumb questions - I'm still working my way through the extensive manual, and things seem to have changed a lot since the 1980s!

Many thanks in anticipation

Kind regards

Dave

UK

### #2 Guest_Dave Williams_*

Posted 07 February 2010 - 05:16 PM

Hi!

Have just purchased a Casio fx 991 ES.

It looks like a great machine which will do everything that I'll ever need and more; however my last scientific calculator was from the 1980s (It was also a Casio!). I'm more familiar with this older style of data entry/display, and wonder if it is possible to get the fx 991 ES to operate in this mode by default.

Specifically:

1) How do I set the calculator so that it defaults to displaying fractions as decimals (expanding to exponential or scientific notation if the capacity of the display is exceeded) instead of expressing these as fractions?

2) Is it possible to get the calculator to default to parse the sequence of commands in the "old style" used by 1980s calculators (which I'm more familiar with) rather than the more modern "user friendly/natural" sequence installed by default.

2) I can't find a "+/-" button to toggle the result of a calculation to its "complement" or "negative" form.

I'm sure it must be there somewhere! How do I do this?

e.g. to change "9" to "-9" I would normally press the sequence "9" "+/-" during the calculation.

I've found a "(-)" button, but this must be pressed BEFORE the digit is entered to get the negative.

Is there a way to toggle the sign of a digit AFTER it has been entered or calculated?

3) I've so far only managed to find only one Memory which can be accessed/recalled during calculations. Are there more memories available which can be used simultaneously?

Apologies for any dumb questions - I'm still working my way through the extensive manual, and things seem to have changed a lot since the 1980s!

Many thanks in anticipation

Kind regards

Dave

UK

### #3 Guest_Guest_Dave67_*_*

Posted 07 February 2010 - 05:18 PM

Thanks anyway.

### #4 Guest_David Christmass_*

Posted 28 January 2011 - 10:00 AM

I grew up with sci fi calculators, in fact owned a Casio, Fx no problem. I owned it for 30 years, it went through college and university with me, then some bugger stole it, and when I had to buy another, I discovered why.

Casio changed the way the calculator operates by default.

Introducing Math mode, which to all intents and purposes tells you what you all ready know 1 divided by 2 is indeed 1 half or 1/2 how else can one say it was one aspect of the redesign!

The reasons for the redesign are basically covert, no one is saying this but it is to compensate for the fact that in the UK, education standards have decreased to a point or stupidity: Writing 1/2 as a solution to a problem 1 divided by 2 now seems acceptable, OH My God, help me when I need a scientist, when I am old and grey!

Anyway to cut to the chase, this is the defacto settings for the FX991ES aka 115 and many other FX si fi calculator model based on it.

This procedure gets your calculator into a mode of traditional use value, the mode we all knew and loved as kids! Who needs a calculator to know 1 divided by 2 is 1/2 the solution is in the question!

First get your calculator to the common base origin Casio started out with

Initialise factory defaults by

(Shift) (9) (3) (=)Yes

Clears all setting back to default.

Set the STAT mode to frequency on

(Shift) (Mode setup) (Scroll down arrow) (4) (1)

Set mode to mixed fractions

(Shift) (Mode setup) (Scroll down arrow) (1)

Set mode to mixed fractions

(Shift) (Mode setup) (Scroll down arrow) (5) Display (1) Dot

Set mode to LineIO not Math mode that gives fractions as a result

(Shift) (Mode setup) (2)

Set mode to Degrees most common calculations are done using Degrees, not gradients or radians which are used for trig and polar measures.

(Shift) (Mode setup) (3)

Most people prefer a nice meaty number to massive decimal places here the max

(Shift) (Mode setup) (8) (2)

Thats for the result in decimal to 10 places ie no sci notations.

Set the calculator to computation

(Mode setup) (1)

Set mode to mixed fractions

(Shift) (Mode setup) (Scroll down arrow) (1)

Toggle the overwrite off (ie del delete not moves back)

(Shift) (Del)

You will do this once.

And I am currently speaking to casio to find a means of flashing that as default into the memory.

But here is an even better tip, on memory issues.

The fx 991 stores last values so you can scroll up and down on last answers using the disc button.

This remains in memory, when you push AC. The memory storage button is more permanent and a right old mess to store and recall, (so avoid that area completely) depend instead on the disc button for temporary storage. To store 5 as a temporary number in the disc button push (5) (=) Now push (AC) to clear display, push the up disc button gets the result (5) back. That is really quick, much better than the permanent memory placement in M memory holds, so you can use these for bespoke numbers, and parameters that you might always need, for example 0.035 in complete optimisim that the treasury are going to reduce the Vat to 3.5%

And you still have the temporary memory for those moment to moment calculations. Recalling the answer or going back in history.

And clearing disc button memory is simple, don't push the AC button push the On button instead,

In fact, get into the habit of doing that as standard practice, and you will always be starting from the same point of origin for your calculations.

I knew the grief of losing my old calculator, why the dumass that nicked it felt their time was more important than mine god alone will know, but these are the solutions to getting good behaviour out of your casio: in a nuts hell sheet of 1 simple script, where you go from base, is entirely up to you.

### #5 Guest_David Christmass_*

Posted 16 February 2011 - 09:41 AM

I have just discovered (remembered) the name of my old casio FX, it was and FX570, I found a picture of it a while back on the internet, now I stare longingly at the picture, it was my third, after an elsimate Sharp, 509 and a Casio 451 or 541 or some thing!

I just discovered the FX991 Base n function, thats great

do do bin bin do do bin bin

do do oct oct do do oct oct

do do hex hex do do hex hex

do do dec dec do do dec dec

AND JUST WHEN YOU THINK ITS NUMBER 1

OH DEAR WHERE IS THE FUNCTION TO CONVERT TO BASE 5, OR BASE 7 OR BASE 3 OR TWO'S COMPLEMENT,

someone please reassure me, please,

the FX570 had base n functions complete did it not,

was it not just a case of base 5 button then 5,

please someone remind me,

I feel so much of the loss, The 991 (what a great number its almost 911) has so many more features,

please CASIO you have not GOOFED up and left that bit out?

Oh I remember well the days of

divide by 5 whats the remainder,

divide by 5 whats the remainder

read the result like Japaneese, ie a bit David Christmassy

and there you have a decimal to pentimal or centimal whatever base 5 conversion,

But do I have to do all that myself?

And I still want the advanced operands to flash the default mode to memory.

Someone said somewhere I read Casio calculators have a security code feature, then did not follow it up, if that is true

Wos it do that's interesting? And can I have a peek and a poke at the memory too?

Glad of any kind of feedback, I know Casio are brill,

I am sure theres is some wonderful Jap fellow out there with all the advanced bits and bytes to tell!

__davidchristmass__

*AT*googlemail.com### #6 Guest_David Christmass_*

Posted 17 February 2011 - 05:54 AM

Having experienced the CASIO UK obsession with telephone support, I conceeded to call the UK HQ as requested on their failure to provide support via email forms on the site.

I received one message from the UK automated response unit advising their will be in touch, but to call the UK number.

That response cost 3 minutes of hang up time on a mobile phone, a 9 minute conversation with a support fellow, only to be told we will look in to it and call you back on the phone, which did not happen, further, I cannot possibly understand how all the programming command sets could be detailed to me as a conversation on the phone, EVEN IF SUPPORT IN THE UK, bothered make the effort to respond and call me back.

So in Short, the days efforts directed to the official site, has be a waste of bandwidth, and my time.

My exploration of the BASE n misunderstanding, that is that the n should not represent denery, but the numerical base for conversion thus allowing number bases other than the four has yeilded the result that the fx570 before had similar functions but the fx451 owned even before that, COULD convert to any number base, and that this is a feature that appears to have fallen off on the FX570 and the FX991.

Why would you want to convert to any base other than the four mentioned. Well the Emperor's Abacus has five beads! and on the next row, I bead must represent 5 beads before it,, sure that is base 5. In computing, there are issues where twos complement in binary might be required to convert 7. As the eighth bit of a binary number carries a sign.

To achieve this task on a 991 one would presumably require the manual mathematical conversion using something like the Modular arithemetic function which are ostesibly about security coding, so one could choose mod 5 and write remainders, but that appears quite long winded.

My other question related to factory default parameter settings. There are many of these. This issue I am sure could be addressed quickly, and easily, in response.

There are many parameter settings, in diagnostic test mode and the indicator is the P number, usually parameter 0 or 3, underneath the Rom number. In the P number is a pointer to the memory address for the parameter settings that make the calculator behave in a particular way, so the P0 setting might be the settings for a 991 and P3 might be the settings for some other calculator.

This means Casio only have to create one board for all calculators, increasing mass production numbers, and therefore cutting base costs, when each unit is tested, some will work, with success in one area, others will fail, but those that fail will be down graded in software parameter settings to models that don't require so many features.

THEREFORE just because you CAN upgrade your 115 to a 991 does not mean that is WILL be correct in all its performance.

Doing business in manufacture in this way, Japan is able to keep the prodution material costs at a minimum, an only need to run one production line for all its models, this means their products are MORE attractive to buy.

UPGRADING a 991ES to another more EXPENSIVE model to save my wallet costs is not what I am trying to achieve or requesting here, in asking for the parameter write codes to set the default setting on a 991 they way I, and many of my generation work and have been trained to work.

My questions about security number access on the CASIO have not been addressed or explained, neither have I found supporting evidence that that is what I need to address to write parameter ram on the Calculator.

I read an article about a FX115 to FX 991 conversion using a knife, I would not recommend that, if parameter jumpers have to be set, electronically, they have to be flashed to EEROM, by enabling test modes. Knifing up the EEROM might take the jumper settings out in one instance, but their again might not in another. And that is probably why now the Calculator settings don't stay in the memory the EEROM' went AWOL under the application of the users knive.

None the less it is precisely what I am requiring to be presented by Casio, the prodedure to enable the write Calculator settings to parameter ram, on the Casio defaults.

The posting about an FX82 or 115 to 991 upgrade that cant happen because the Jumpers are missing on the B vs compared to the A is address by they DID NOT JUST vanish, the Jumper settings are stored in an EROM on the new board design.

I have now READ online that they are now deleting the fx991eS in favour of the fx991 plus. I fully expect to be able to buy a 991ES from existing stock levels and am going to go out an buy as second one, which I shall leave in a box until I am old and grey. Then when my working unit fails, I will never have to face the problem that is very recent, in IT, and not at all in my training in Computer Science, that I have to change my head around to the way a piece of sand operates, rather than have my computer work to the way I require it to function.

I had 25 years success with the Fx570B. CASIO Japan have done me well. So, having demonstrated such success, I just expected it to be STILL sold.

Lets see what turns up tommorrow?

### #7 Guest_Guest_*

Posted 18 February 2011 - 08:13 AM

Just found out microscoft are playing stupid buggers with my hotmail access, it worked 2 days ago!

Christ I hate IT!

### #8 Guest_David Christmass_*

Posted 19 February 2011 - 08:53 PM

Great! After 13 hours I managed to access my own hotmail account, looks like BT had a rough day but thats that sorted.

Looking at the forum today I read questions about the FX mod functions, and general settup troubles, relating to Maths returns in stead of digital.

The guest user from Brazil requiring a FX 991 can obtain one from Argos the catalogue shop.

ANY user with digital response problems (differences of new ES calcs to traditional calc) returns SHOULD look back at my previous posting defacto standard configuration for the 991ES.

I am no nearer finding the means to enter these settings into the primary default calculator setup. I NEED JAPAN to release a technical user configuration procedure for their FX991ES.

FOR Japan, I have 3 criticisms of the way the 991ES functions from a user perspective. These are firmware configurations and therefore CAN be updated.

The preset configuration problem vsv parameter settups, that the calculator ships to show off the wonderful math functions of the unit, (AND THE 991 IS A WONDERFUL CALCULATOR so don't go doing hairy carey) and (to date) no one has been able to advise how to confirure this to applications the user needs.

The Memory button, not ans memory, but M+ M- As the 991 has 3 variable memories, X Y M the store button functions as a two button press, to store to X Y or M addresses. In fact there are memories A F also, these get accessed I think by some kind of Alpha keypress. The Shift Store button then M+ or M- or M+ on its own should Store, ADD or Subtract from default M locations. M location should be returned by RCL button alone for speed, or recall followed by X Y M. AC shift store M+ X Y or M CLEAR Memory these locations, in truth clearing the XYM memory is more of a reset task, and very awkward given its primary function: So see and read my tip about using answer memory instead. THE correct way to store info in multiple stores should involve a Shift (recall) to Store, followed by X Y or M locations, and Shift (recall) Alpha, A to F locations for fixed variable stores.

The correct RCL procedure should be Recall X Y or M.

M+ should add ANS to the accumator M location. M - Should subtact it. AC should clear M location, as should AC SHIFT STORE M X or Y.

Base n WHICH REALLY MEANS BASE numeric, SHOULD BE ANY NUMBER BASE, not 4 digital ones THE N, IN PHRASE BASE N HAS ABSOLUTE F-ALL TO DO WITH THE DECIMAL REFERENCE BASE OR DEANERY IT MEANS THE NUMBER OF CHOSEN BASE . I READ IN MANY OF MY OLD MATHS BOOKS CALLS TO PERFORM BASE 5, 12 AND 7 CONVERSIONS. ie the N does not stand for BASE 10 it stands for the base number of your choosing, which could be anything.

THIS APPEARS TO HAVE BEEN MISUNDERSTOOD IN LINGUISTIC DESCRIPTIONS.

WHEN a calculator tells me it does BASE n conversion, I take that to mean it can working in ANY number base, not just digital ones. If this worked, as it should, MOD could be achieved using BASES.

AND THE MOD button does not exist. I read the post about its non requirements, on the grounds of Xdivided by y = result, in MATH MODE D to> S (the S>D button toggle) takes the result from dec fract to a b/c perfect fraction mode result, thereby reading Mantissa, remainer, base. Then I read someone trying to do Mod((87^7),187) ie Mod 187 of (87 to the power 7) which fails the SD button conversion.

THE REASON the MOD button is required, is that numbers were stored in the traditional FX570B and 451 calculator as fraction even though they made no claim to true math type function. It is more accurate to store PI as 22/7 than to state decimal 3.1415.. . to millions of places: this is how the old calcs stored things for accuracy and because of memory restrictions.

This allows the MOD function to BYPASS memory overflow SCI NOTation parts of the procedure restrictions in presenting the a very accurate exact result, which in Modern Math is required.

IT IS important to have these issues corrected on the unit.

WIZZARDS telling us how to achieve this with MATH calc fail in the understanding of knowing limits to a calcultors abilities. When working with security coding aspects and functions non reversible transpositions, it is JUST NOT acceptable, (as I read elsewhere) to perform a calculation and round up or appromiate, doing this in Modern maths would result in inaccurate Key comparisions. That my brain can do the function ain't my problem, I bought a calculator to prevent my brain from getting full on unnecessary junk.

FOR those with functional definition capacities, (or a Japan whiz working on a rom update for the calculator) here is the formula for achieving a mathmatical Mod function, sourced from the good old traditions OPL: and PSION.

PROC mod: (a,

RETURN a - INT(a/b) * b

ENDP

where the input is a modulo b = result

There it is live from the Martyrs Park UK, what in the world made anyone think they could blag off the UK with inferior procedural tasking on hardware: there still exists in the UK, some where near me, mathematical genies, even if they are not readily apparent to view.

### #9 Guest_David Christmass_*

Posted 21 February 2011 - 09:42 AM

hi all reading the line, on the Casio Mod Base maths problem.

Heres is the current state of play at the Martyrs park!

I discovered a wonderful site after my own heart all will be interested in NO Doubt!

Its run by mike sebastian and it is brill for casio info!

http://www.calcinfo.com/

Now I checked out the spec for the Casio FX991 ES and it turns out it has a wonderful chip made by Hitachi, so now I know were I am, off I troll to find the full electronic Data sheet for the chip, and that will tell me Exactly what the devil I have to do to gain access to flashing the presets the way i like them.

Later today I am gonna shell out for a Spare Casio, for the cupboard, for the future! It is just once I got my head around this little beaut I don't wont to get old and grey and bald in the head, and have to learn how to work a calculator a 96 on my zimmer frame!

Now for anyone interested in getting their kid a calc for school, my O's were done using an Elsimate Sharp EL 509 but when I got to Engineering school I out grew it.

I bought an Fx451 for FE, but the membrane broke, and I had to buy another one for work which was a Fx570B, in a wallet, and that did me right through University and Work life.

This FX991 is awesome.

I discovers some interesing things about Casio numbers

The FX prefix means Sci fi calc features.

The S suffix means Standard

The MS suffix means Maths Standard

The ES suffix means Education Equation Standard

FC means its good for the Chancellor of the Exchequer to do his somes on, or the Ex Prime Minister

The main differences between ES and MS are the keypad legends. If you grew up in the 80's using a classic calc the MS presentation of keys is more accessible and understandable.

That said reading the MS presentation of display can be confusing, so the ES is better in that area, definately.

But the ES has graphical legends i.e the improper fraction, (when the top is greater than the bottom) is in the box over box graphic, where as on an MS the d/c denotes the same function.

This can really scupper you when you are used to visually recognising keys on the pad by legend.

the root key and square keys differ, as many others on the MS its xto the power y on the EX its X to the power of the black box.

I think the ES is more graphically accurate, and mathmatically accurate. It think the ES is a definate step forward for Casio : I think of it this way doing pi 22/7 you never suss the end of if, to store that on an MS in standard form, what getting 12 digits back on the display and perhaps 20 ghost numbers you never see in the guard figures. That is big time memory space, so just saying 22/7 surely must take up less space.

The implications of the Math mode in computer terms will be massive to accuracy.

Anyway I must get on and find details about the Chip,

From the calculations on Mikes site it appears many of the Casio FX- models present the same number, therefore, they must use a similar chip.

As the FX991Es presents the same results as the FX-9750 one might readily assume that it has the same chip under the hood, or at least one very similar.

Therefore refering to the page

http://casiokingdom....ords=fx-9750gii

it could be true that under the black blob there rests a

Renesas SH7705-based microprocessor of the fx-9860, fx-9750GII and fx-7400GII

I MEAN WOW! THAT IS PROGRAMMERBLE, WHY WOULD YOU WANT TO TURN AN FX115 INTO A FX991 WHEN YOU MIGHT BE ABLE TO MAKE IT INTO A PROGRAMMABLE CALCULATOR FOR THE SAME BUCKS?

Myth or superstition, well lets find out? See you soon! I am off to learn about programming the Renesas, if only to solve my immediate problem of MOD functions and parameter basics?

AFTER I GONE DOWN and SNATCHED MY SELF ANOTHER ONE BEFORE THE SHOP RUNS OUT!

### #10 Guest_Guest_*

Posted 22 February 2011 - 08:10 AM

After my posting yesterday, I managed to buy the last FX991ES Plus stocked by Argos, and I am promised more will be on their way for the future! The second Argos shop in Canterbury still has some, and Thanet Business Systems can order them still.

I could not obtain a FX991ES as the product is upgraded to a FX991Plus. So I am keeping hold of the FXPlus for times when I am very old and grey.

The major difference between the FX991ES and the plus, is the manual of the Plus is a manual, and the old one has a manual which is a spread page for multiple languages.

The new plus manual is a brilliant change of design, for the users, it is better than wrestling on a page for the answer and contains much the same information as the spread page, less the multiple languages, but both items are not the full manual, let me explain.

The best manual to get is part number RCA502160-001V01 with appendixRCA502126-001V01 THIS IS AVAILABLE FROM THE CASIO SITE, IT IS THE FULL MANUAL. MICKLE PRINT OF CANTERBURY MANAGED TO CREATE A BOOK FOR ME FOR ABOUT 20 POUNDS, OF THE TWO MANUALS COMBINED AS ONE UNIT.

The Manual supplied with the 991ES plus is the RJA521119-001V02

no appendix.

The Manual sheets supplied with the older FX991ES are

Manual HDCSR380SM9 (Spainish)

SA0411-B

Manual HDCSR380EM9 (English)

SA0411-B

Appendix HDCSR380TP2MWU (Multilingal)

SA0608-D

THE FULL MANUAL AND APPENDIX AS BOOK FORM PRINTABLE ARE

RCA502160-001V01

RCA502126-001V01

THESE are on the http://world.casio.com/edu/ site.

THE FULL MANUAL IS ONLY AVAILABLE ONLINE IN ELECTRONIC FORM.

JAPAN LIKES TO SAVE TREES.

THE PDF FORM IS BETTER AND MORE SEARCHABLE THAN A PRINTED MANUAL.

THE PDF FORM CAN BE PRINTED TO PAGE AND BOUND BY A PROFESSIONAL PRINTER LIKE MICKLE PRINT IF REQUIRED. THIS IS USUALLY HELPFUL FOR EDUCATION PEOPLE AND BUSINESS PEOPLE ON THE RUN ABOUT THE WORLD, IE NOT AT A DESKTOP.

CASIO MIGHT BE ABLE TO SUPPLY A PRINT BOUND VERSION ALSO, AT A PRICE BUT USUALLY ONE IS REFERRED TO ONLINE SUPPORT FOR THINGS LIKE THAT.

THERE DOES NOT APPEAR TO BE A MOD FUNCTION STANDARD ON THE FX991ES PLUS EITHER.

Exploring the problem I question myself about the capacity of the FX570 I owned before and ask could that even calculate a number as large as 87^7 Base 187 without overflow.

Probably not!

But that is not my excuse, I am going to try to find a method to do achieve this.

The 911 plus does not have multibase functions either, ie true BASE n which includes all number bases.

Thats enough for today, I hope CASIO are pleased with the commercial improvement to their company.

THANK YOU VERY MUCH JAPAN!

### #11 Guest_Discovery of the Day!_*

Posted 22 February 2011 - 08:54 PM

Todays events, Major Step Forward, the Discovery why there is a missing legend above button 6: THATS BECAUSE ITS THE BUTTON WHICH YOU WOULD POTENTIALLY PRESS on an FX991ES AFTER SHIFT TO ENTER PROGRAMMING MODE!

Of course it is left off because the fx991ES does not program, hey but the fx 50 does!

The next point is examining the board circuit to discover the woolly jumpers and links that could have been made, were the fx991ES not to conform to education standards, and were the fx991ES better placed as a programming calculator rather than a school yard calculator.

I discovered some of the basic methods in Casio programming its all rather simple ? is input and ?-> A shoves the input into an varible placement, and . . . so all that needs to occur is to transpose the psion procudure for mod calculations into casio operands and parameters as a program.

Base n function problem looks a bit more difficult to achieve, it might involve using a table feature on the fx991 then reading the result upward, certainly it would be much more of a challenge to add and subtract and multiply and divide using bases other than the four standard.

The thing is I want to minimise the required key pressess for the user. That is the objective.

I am certain I have done base 5 calcs on a Casio fx451, I am certain the current new range of fx451 or 570 are different to the originals that were produced in the 80's. I think my next step will be finding the original fx570 and 451 manuals to read, as mine are long gone out of place.

### #12 Guest_Guest_*

Posted 24 February 2011 - 09:10 PM

FORGET THE KNIFE MODS, AND UPGRADES, TO THE JOB RIGHT.

Here it is the full monty documentation about YOUR CASIO CALCULATOR WHOOPS! I MEAN COMPUTER!

DOCUMENTATION ABOUT THE RENESAS 7705

http://www.renesas.c...cumentation.jsp

TOOLS OF THE TRADE PICING AND PROGRAMMING TOOLS FOR YOUR CALC

http://www.renesas.c...tools_index.jsp

THE FULL SPEC WHAT IS YOUR CASIO LIKE!

http://www.renesas.c...tions_child.jsp

THE CHIP DATASHEET (HOW FAST CAN YOUR CASIO RUN?)

http://www.datasheet...-datasheet.html

THAT SURELY IS ENOUGH FOR THE DAY, AND GOODDAY ALL, I MUST REALLY GET ALONG!

I NEVER KNEW THERE WAS SO MUCH IN IT, AS THEY USED TO SAVE ABOUT THE TV TIMES!

BEST WISHES TO YOU ALL

DAVID CHRISTMASS

### #13 Guest_guest_*

Posted 05 March 2011 - 06:47 AM

### #14

Posted 05 March 2011 - 02:02 PM

how are you are you fine I wish you are fine

Im tarek boot I have problem with my casio fx-82es version B there is some function in 991es in my calc I tried remove it I pressed (on key many times)and( shift+on+7) clear(setup-memory-all) and this way

Initialise factory defaults by

(Shift) (9) (3) (=)Yes

Clears all setting back to default.

Set the STAT mode to frequency on

(Shift) (Mode setup) (Scroll down arrow) (4) (1)

Set mode to mixed fractions

(Shift) (Mode setup) (Scroll down arrow) (1)

Set mode to mixed fractions

(Shift) (Mode setup) (Scroll down arrow) (5) Display (1) Dot

Set mode to LineIO not Math mode that gives fractions as a result

(Shift) (Mode setup) (2)

Set mode to Degrees most common calculations are done using Degrees, not gradients or radians which are used for trig and polar measures.

(Shift) (Mode setup) (3)

Most people prefer a nice meaty number to massive decimal places here the max

(Shift) (Mode setup) (8) (2)

Thats for the result in decimal to 10 places ie no sci notations.

Set the calculator to computation

(Mode setup) (1)

Set mode to mixed fractions

(Shift) (Mode setup) (Scroll down arrow) (1)

Toggle the overwrite off (ie del delete not moves back)

(Shift) (Del)

without ressault please help me hurry thank you

### #15 Guest_Guest_*

Posted 18 March 2011 - 07:27 PM

If you read the thread you will find out the links I gave detailing the Chip that runs the computer.

The way things work is eerom, electronic erasable read only memory. Like an SD card, the prefs are set in that storage locale.

Its the presets that define the functions available to the calculator: these tell the calculator what model it is and how to perform. A lot of people on this thread have been doing silly things like knifing up the chip thinking it will change the presets in the ram, it won't all it does is short circuit the ic pins and send the calculator into some kind of random mode.

Clearing eerom is a function called at low levels of the programming of the chip. It involves streaming the data from the calculator through a pod, to a computer. On the computer the low level information is changed via a programming development interface, the Calculator is configured, in this way, then the information is sent back to the eerom, as a flash stream. The errom is then locked, and the program in the errom functions as defined by the program routines loaded. Parameter settings enable or disable these routines, that is done by setting the mode of the calculator, in the presets parameters on the calculator.

The only way to get back to start from a very low level clear of the eerom, is by reloading the software with the original program routines.

How to achive that is not in Public domain because to get back from that stage involves having information stored already on a computer to dump back to the calculator as a reload.

Your only option on that is a back to base refresh from casio service desk.

Sorry not to be of more help, but simply I can't get your calculator back to factory state, once it has been hacked and changed at random. Think of it as themes for your mobile, only casio have the generic original variety of themes for their calculators.

What the procedures you have done in refreshing your calculator to defaults, is correct. The stepped guides of configuration settings DO NOT ALTER the information in the eerom, or rewrite the way the calculator functions, all it does put the calculator in a more traditional mode.

If you have functions present on the 82 that should not be there, because of what ever reason, fault or misguided hacks (especially with the knife suggestion) you will have to get the calculator reflashed by a Casio service agent. That is return to base.

Best wishes

David

### #16 Guest_Guest_*

Posted 22 March 2011 - 01:17 AM

I Just discovered that someone has put a smiley milley RIGHT IN THE MIDDLE OF MY DESCRIPTION OF A MATHMATICAL PROCEDURE.

Now THAT IS SO FRUSTRATING to me, and NOT TO MENTION A complete MIS REPRESENTATION OF MY WORDS.

SO HERE IS THE PROCEDURE FOR CALCULATION OF MOD ARITHMETIC FUNCTIONS as it should be- MINUS THE DJ SMILEY FACILITY-

PROC mod: (a,b)

RETURN a - INT(a/b) * b

ENDPROC

DAVID CHRISTMASS

### #17 Guest_Guest_*

Posted 22 March 2011 - 03:14 AM

This complete thread is absolutely vital for beginners to read, many posts I read on the board can be solved using the information and settups I describe.

I hope I have sufficently explained the differences in Casio s for the purposes of the mums and dads completely beside themselves on what to buy little Johnny for their school life.

The current status of the 991ES and the plus. It is the very best of Calculators extant on the market and will see little Johnny right through to either he jumps ship into industry or he ends up doing an undergrad course in pure or applied Maths at Uni.

The current state of play vsv true base n functions: that is the capacity of the calculator to perform conversion to bases other than the main 4 listed, bin oct hex and dec.

Casio support advise this is not a function available on any of their calculators. What that means is they take my point and will refer things for change to the boffins in Japan. I have never seen the Japanese fail at any task and once presented with a question, I am sure they will address the issue with a firmware update to their calculators in the future. Watch the Casio education site for more information about that, as and when they decide this revision will be instantiated.

I am sure the greater part of academics will press for this capacity, but the situation is much one of the criterion of National curriculm specs, and if that is not required for the curriculm then the spec won't change. From my point of view, being pre curriculm, I consider the appreciation of A WORLD OUTSIDE DIGITS, and A WORLD BIGGER THAN COMPUTER NUMBER BASICS, essential. What that means is an apprecition of Analogue computing methods, and bases other than those used with computing.

Base 12 fell off the planet with the transition from imperial to metric. This is a Euro motive, sooner or later the world will regret the lack of skills extant in the imperial systems, used by the US, UK and Australia.

From the modular perspective. There exists descent, about modern maths methods. Why should clock arithmetic be required, well the answer really is security.

Casio advise me the 9860G has the Mod function. Having the Mod function and the Base n any base function is something that is to be addressed by the Casio team in the future.

Upgrading your casio to have these features will not be something one can achieve outside of the Casio service group. When the features are implemented in the production process, I fully expect Casio will look after supporting its existing user base.

Casio are currently overwealmed with demands at present, and it took their rep 3 weeks to get back to me with some answers.

Simple mod conversion can be achieved in a variety of methods. For those with program calcs the Casio procedure is presented on the board, the above procedure for mod has be Casio fied, by another posting on the board which is more familiar with the Casio program language.

For those without Casio program functions the basic mod tasks are achieved only through creating a diviso statement then an improper to proper fraction conversion. For example 7 mod 5 would be represented and entered as 7 divided by 5, that would present 7/5 ths as an answer then from that improper form to the proper form 1 and 2/5 ths which means one clock turn and 2 units mod 5. This method is only true to the physical capacities of the calculator in returning answers without overflow, and so there are limits, casio appreciate that limit, and are working on something at present, I know not what, is behind trade secrets.

People posting on this board frequently raise questions about the form of return of Casio Maths calculators, being confusing. Ie maths linear modes. The REASON that CASIO created maths mode is simple. Obviously it is a selling point, but more, it is a major development in maths: it does not seem like that to those of us familiar with the traditional form, but consider pi

you could write pi as 22/7 that would be exact.

The defining decimal number equivilent to pi is only constrained by the physical digits the calculator is capable of producing.

On a 10 digit calculator, that would show 3.1428571429 and of course nothing like the full range of pi: in other words you don't get the full share of pi with the decimal representation.

As the major part of the 1980's was defined by a massive campaign the feed the world, it was deemed completely unacceptable to have only half the pi represented when the full pi could be achieved.

So therefore the basis of transition to the new form is correct and more exact on the ES than the MS ranges. That said there is still a requirement for people familiar and in need of decimal to have legends and results in the forms familiar to them. For that reason the MS range exists also. But the ES range has the capacity to achieve both tasks.

And so there it is, the hole pie, the full pie, and nothing but the pie in Casio mathematical form.

Please do read all the postings I have made on this board, as a new person, many of the questions of beginners will be addressed in my posting here. There is much information about programming for development teams, applying calculators to engineering tasks, outside maths as prototypes of new pieces of kit. The Casio Calc will be with us for many many years in the future I am sure.

There is vital information on my postings relating to hardware issues at a very techincal level. There are also postings detailing how the new beginner can receive the best information from casio by not just accepting the manual in the box but by reference to other manuals presented by Casio in the past, which are more detailed.

I expect this will be one of my last postings on this thread.

I have nothing more to say until I am advised different by the Casio people.

Best wishes to you all, and enjoy your Calculator, and please don't take it for granted.

David

### #18

Posted 22 April 2011 - 08:00 AM

I used the knife in my calc to do to mod in this step I do it wrong in the calc after that I tried to upgrade it software again by this way

......[...the same until it shows "r=xxxxx" ]

Before the "r" input ?1 [means sqrt(1)]

Press the key "M+"

Press "AC"

Input ten Ans [means press the key "Ans" ten times]

Press the key "log??" [the top right key] once

Press the key "Abs" once

Press the right arrow key twice

Press the key "(" ten times

Press the key "="

Press the left arrow key twice

Press the key "sin" seven times

Press the key "="

Press the left arrow key twice

Press the key "(" seven times

Press the key "="

Press the left arrow key twice

Press the key "(" six times

Press the key "="

Press the left arrow key once

Press the key "(" nine times

Then do:

[Press the left arrow key once

Press the key "(" nine times]

Again and again until there is nothing on the screen

Press "AC"

Clear Setup

Clear Memory

Press the key "mode"

Press the left arrow key many times then press the right arrow key until the constant is suit for your calculator

but I tried it wrong after that I opened my calc and I saw some functions of 991es in my calc I tried many ways to reset my calc to it defaults what can I do david I sure you can help me thank you

### #19 Guest_Guest_*

Posted 24 April 2011 - 07:52 PM

Tarek, thanks for being honest. The bottom line is that if you have split the chip using a knife mod that someone MISsuggested, your calculator will prove to be unreliable.

I am not surprised that you have tried a variety of combinations and strange things occur on the screen.

The chip is a multi pin very large scale ultra high density device.

Even with my skill and ability, having worked on circuits that cost over 60 thousand pounds, 20 years ago, I would be extremely hesitant about attempting to even contemplate success in changing a chip of that grade on the board, which is what will need to happen.

Some people obtain success using hot air blowers, they heat the board up to 500 degrees and the chip falls off. Once that is achieved, and the problem is that at 500 degrees, there is an almost definate chance of the tracks becoming insecure on the board: there is still the problem that the solder will have spread across the track as well. If your knife mod action has damaged the tracks they will have to be repaired using metal track repair paint. That approach will almost certainly be a disaster.

All in all things look very bleak indeed for your casio. The problem is how much time and skill do you have, and is the unreliability factor which is almost 99% of a failure more acceptable than buying a new Fx991 which realistically is only about 17 pounds.

Given the time of an engineer skilled enough to even look at the problem would be about 70 pounds, buying a replacement seems your most efficient solution.

I do not say that lightly, I appreciate hardship even with my skill. And if there was any possible way at all, with even the slightest chance of success in saving you that expense, I would offer you that answer, but there isn't, tareck, there simply isn't a way to repair the item in anything less than a months full time attention, and some pretty precise equipment. These items are precision made by robots with microscopic toleranaces in placing components, neither I nor you have them, just the factory that produces the items in Japan.

Thats all I can say.

David

### #20

Posted 25 April 2011 - 03:04 PM

### #21 Guest_kubiq_*

Posted 30 April 2011 - 08:40 PM

-x^3 = x^2 - 4x -3

but it has more than one result.

When I simply write it in calculator then Shift' />[Solve][=], it shows me just one result... how can I get more(next) results?

### #22 Guest_rockz917_*

Posted 19 May 2011 - 03:39 PM

I want to solve equation

-x^3 = x^2 - 4x -3

but it has more than one result.

When I simply write it in calculator then Shift' />[Solve][=], it shows me just one result... how can I get more(next) results?

1.) MODE SETUP

2.) "5:EQN"

3.) "4:aX^3+bX^2+cX+d=0"

4.) a=1, b=1, c=-4, d=-3

5.)"="

### #23

Posted 15 April 2014 - 02:02 PM

Link- https://www.youtube....WPT2vYxGB1s5zvy

### #24

Posted 15 April 2014 - 09:19 PM

### #25

Posted 16 April 2014 - 06:10 PM

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