If you've found this page useful, consider linking to us so that others can benefit. Think you've spotted something incomplete or incorrect on this page? Please let me know! Please use our forum to post messages and get in touch with other calculator collectors and enthusiasts! General specifications Type Scientific programmable calculator Production years - - New price - Operating system n. Briefly describe what you feel is missing or incorrect.
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Search Member List Calendar Help. Login — Register. Threaded Mode Linear Mode. Post: 1. This specimen remained for almost a year for sell at a local auction site.
Finally I decided to acquired it, for the principesca amount of 15 Euro. I believe it relates to the case silver color, although the CR power cell also contains Lithium.
Front panel was kind of lose, due to the adhesive film dried glue. The back cover is fixed with four screws that, once removed, allows the cover to slide and lift. It uses a single 3 Volt CR Lithium battery cell. The power consumption is 0. Keyboard assembly foil membrane attached to the PCB. One unmarked SMD ceramic capacitor at top left side. Keyboard rubber membrane.
Real quality plastic keys, sporting injection molding manufacturing. These keys don't "click" to give a mechanical feedback, but they register successfully on every single key stroke after so many years of usage. And when they fail to register, a easy cleaning is all it takes to restore normal operation.
Partial exploded view. Post: 2. Hi, jebem! During a few years I used fxpv, and then it was given as a gift for somebody, because this calculator is very primitive for me. What exactly attracted You in it except a price? Post: 3. From what I see from some of your posts, probably you also are in the same route, no?
I am in a phase of collecting machines from when I was a teenager! So, I am buying pocket transistor and small valve radios and calculators mainly from the 70's and 80's.
My first contact with Russian technology Professional radio transmitters, radar, consumer receivers and calculators was in in Mozambique, when CCCP went there for cooperation. I was living there at the time, and I have worked with the Soviets for about 4 years, before returning to Europe.
My electronics background "invites" me to have some strange hobbies for a lot of ordinary people Check this valve class A stereo amplifier that I have built in the early 80's sorry, the site is written in Portuguese. I spent a small fortune acquiring these high quality expensive high voltage components, but the sound is amazing if one enjoy high fidelity. And above all, I had real fun and very good time designing and building it! Post: 4. Yes, I too from that epoch. Portable radio receiver from "Hitachi" 60th, radio-cassette "Sanyo", transistor amplifier "Schneider" and many other real things from th for me remain the standard of technical idea.
Old calculators also are part of my life, but not all from them were good calculators, and it is a fact. Your materials are always very interesting for us. I hope, you will continue this work. Post: 5. Back then it wasn't uncommon to use the Lithium label as indication for long runtimes. My first LCD-watch also carried it. Post: 6. The Lithium refers to the Lithium battery which was a relatively new innovation at that time when most other calculators were using AA or AAA Alkaline batteries.
Post: 7. Little off, this is a PV - but check the picture at the end of the blog. If a Chinese is surprised that it is being falsified, then the world is over. Post: 8. Csaba I love knock-offs and collect all I can! I'd buy the Catiga if it was available here. Post: 9. Post: Baltika is my current preferred cleaning system. We have one Mix Markt russian store in Lisbon. They are popular around Europe. Despite many of the canned products are manufactured in Germany, they use traditional Russian recipes.
However one of the top class products are the Baltika genuine beverages. Have you got a link about how is it can be done? Please check the P PCB here: link to picture - maybe this condensator same? Thanks for the answers! It is possible to overclock these Casio calculator series, but results are not guaranteed.
I didn't try on this particular model, but similar models responds well to overclocking, despite consuming more battery current. These SoC system on a Chip calculators have the oscillator embedded in the chip but usually the operating frequency is set by a single external resistor of usually high value in the order dozens to hundreds of kilo-ohms.
In this model in particular there are only two components to change and test: - The KOhm resistor most probable component controlling the oscillator frequency ; - The unmarked SMD capacitor not probable at all, but who knows, testing is required. Pictures showing these components are available at my first post. To do this modification, a basic oscilloscope and a current meter in the micro-amp range would be the minimum tools to start changing the oscillator frequency.
A frequency meter of some sort would be useful too. Changing the components in the blind is not recommended, as the results can be unstable due to excessive oscillator waveform distortion , or else it will consume excessive current depleting the batteries at a fast rate. Or I just try to figure out how changes the speed of a running program if I modify values of these elements.
I am not sure how the resistor is set the frequency itself. This resistor and capacitor works like an oscillator?
As I can remember and Googled this system is not oscillating - or may I am wrong? Thanks for any hints! As I can remember and Googled this system is not oscillating Sure it works as an oscillator.
Look for "RC oscillator" in google. There are several RC Oscillator variants, from a basic single transistor feedback loop, to more sophisticated operational amplifier designs, or even a astable flip-flop design. In many of these basic calculator designs using just one chip, it is common to have the capacitor integrated inside the chip. This capacitor capacitance is usually very small, in the order if hundreds ot pF only, therefore the resistor value must be in the order of several hundreds kiloohms to achieve the nominal low oscillator frequency..
These Casio series runs at frequencies around to KHz only. These machines are slow and in this way they save the battery that will last years. The lower the resistor, the higher the frequency will be. However the rc oscillator will not work with any range of resistor values and tbat is why there is the need to try and test.
If inside I found a crystal oscillator, can I try to change it? Because the oscillator is internal to the chip, there is on way to know in advance what exact formula to use. That is why people playing with this subject of overclocking use the experimental method and sometimes one can guess the actual formula from the test results and even guess the internal oscillator circuit in use.
To be honest, I am not a adept of overclocking anything anymore those days are gone for me , although I enjoy to see other people fiddling with it. Another resonator could be used, but this may cause issues on the LCD operation. As I said before, one would need to experiment. It is a try and error job. The low value resistor is usually used to limit the current consumption of the calculator and should not change the oscillator frequency. The high value resistor above Kohm typically is the one to check.
There is no need to remove the resistor. Just solder another resistor in parallel. Concerning the additional resistor value to use: It is a test and try job. If the machine hangs, use a resistor with at least two to four times the original value and try again.
If it works, use lower values until it stops working. I've overclocked my FXG from 0. In the case of the FXG, you only need to change the resonator. English American. CASIO fxP scientific calculator from This specimen remained for almost a year for sell at a local auction site.
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