I decided to share this log as this trusty computer 计算机 been with me for 20 years and I just threw it away today.
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I got myself a very new FX991. Well it is a 8 bit computer , with no ram no harddisk, with some register and with a display of 10+2 character.
What are the modification done to this machine ?
1) Overclock to 5X the speed. Tested with stopwatch, the slowest operation with this calculator is 110C52. The combinatorial function
C(n,k) is defined as n!/[k!(n-k)!], where n! is the factorial function.
Normal calculator can take up to 20s to find the answer. On my HP 11C it took over a minute.
After overclocking it took about 2s in non turbo mode and within 1sec in turbo mode.
2) added Rechargeable battery, these battery are charge using the solar panel allowing the calculator to be use without any light. I wounder why after so many years calculator still do not have this function. The rechargeable battery can last up to a week when new.
Casio Fx 115s Calculator
3) turbo, overvoltage overclocking. Crazy speed for bragging rights only.
Here I have a picture of the rechargeable battery switch. Have to on this to charge as well. The rechargeable battery is the one in blue above. They make the calculator FAT so that it would angle up for easy viewing , this open up the space available inside to add part required for this mod. Notice the wraping of plastic near the top, This is cause by overheating when I tried to charge the rechargeable directly under a lamp.
Here is the TURBO switch
Casio Fx-115s Batterie Wechseln
Note the exam approval sticker at the back, The calculator with mod made it to A level, and all my U exam.
Next up is how overclocking and LCD contrast are adjusted, by changing the resistor on the RC (resistor capacitor circuit). Yes they do not have to invest in expensive crystal for clock control and it rely on an RC network, maybe they have a 555 inside. (555 is a clock control IC)
So after reading this article have you press 110C52 on your calculator to see just how long it take for it to calculate that. Got you!!!
There used to be a time when Casio was a big name brand. They were top of the line. If you wanted to listen to music, Casio was somewhere in there. Then, music went digital, and Casio became a relic.
Now, they’re not exactly on the level of your neighborhood store just yet. They haven’t fallen that far. But in order to get a grip on the market, they have to release gadgets that look innovative and exciting. You know, casette players just don’t cut it anymore.
And that is why we have the Casio FX-115ES Plus. Casio minces no words when describing this product: they call it the most advanced scientific calculator available. How’s that for an accolade? And while manufacturers do try to ramp up their productions a little bit in the descriptions, they might actually be right in these case.
These kinds of things are used by students that crunch numbers. A lot of numbers. You know, MIT types and the like. So why do these guys need the Casio FX-115ES Plus manual? Well, they might be good at math, but they probably aren’t as good at taking Casio’s biggest “we’re still in the mix” cannonball to the chest without at least some confusion.
Where can I download the Casio FX-115ES Plus User Manual?
Do you know what else Casio did? They added a solar battery to the thing. Yep, solving the most complex math equations wasn’t enough. It had to had a solar battery, too.
Cross Product Casio Fx 115
That battery is probably going to give you some trouble, and if you aren’t used to complex math calculators, this thing is going to make you want to change courses. With our Casio FX-115ES Plus user manual, though, you’ll be right back at solving those equations that broke all the other, less advanced calculators: http://sharedf.com/documentation/casio-fx-115es-plus-owners-instruction-manual/