Interesing feature on the fx-260: When doing statistics (standard deviation etc) you can enter any numvber of data points. How does it handle a thousand numbers in the small anount of ram it has? It doesn't store the numbers. Instead it stores all of the different kinds of results and recalulates them every time you add a number. Or a hundred identical numbers all at once, which is something else that it can do.
You can find some crazy functionality mods for these Casio FX to unlock features from other models by scraping away some of the epoxy and shorting pins.
Is there enough detail of the ROM to get a dump of it? It'd be really interesting to try and make an emulator for this, and possibly trawl through the ROM looking for hidden functionality...
Is there any way to do one of 2 things to my (Casio fx-991MS or any other two-line Casio scientific), such as: Giving it power-off memory safeguard (of the calculation history) after it auto turns-off; Or, failing that, Increasing the number of minutes before it auto powers-off (and erases my calculation history). /Regards
commons.m.wikimedia.org/wiki/File:CASIO_fx-92_Collège_2D_integrated_circuit.jpg Here is a die shot of another calculator, the Casio Fx 92 college 2D+, which has a "natural display" it displays calculations like in a textboook on a 96×31 pixel dot matrix display. (it looks like that: www.mathematique.org/uploads/6/1/8/1/6181325/8185036_orig.jpg ) It has an OKI ML610901 chip with a 500KHz 8-bit CPU, 96KB of ROM and 3584 bytes of ram
The 3rd edition of my favorite pocket calculator. In my opinion the cases kept getting worse. Second one feels cheaply made and the Solar II feels like a toy.
Please avoid EEVblog references. Kids watch this channel and need to be keep away from dangerous, toxic places like that. It probably puts people affected by misogyny off too.
The videos are sometimes misogynist, e.g. the "in like Flynn... Eroll that is". Sometimes racist too, e.g. the "Won Hung Lo" comments. The forum is full of toxic people and Dave himself has doxed people in the past. It's definitely NSFW or kids and adults should be careful to protect themselves and their personal information.
Nice touch running it on ice cubes.
John Possum It could probably run on a potato battery...
Excellent die photographs. It's incredible how much functionality can be packed in to a relatively small space and be so mass produced.
_I am surprised and delighted by the amount of lore attached to the Casio fx-260 calculator!_
Interesing feature on the fx-260: When doing statistics (standard deviation etc) you can enter any numvber of data points. How does it handle a thousand numbers in the small anount of ram it has? It doesn't store the numbers. Instead it stores all of the different kinds of results and recalulates them every time you add a number. Or a hundred identical numbers all at once, which is something else that it can do.
Wow you weren't kidding when you said extreme teardown. Excellent video and great explanation of how the internals work.
That’s a tear down! Subscribed
Cool! A great follow up from EEvblog.
Thanks for sharing!
You can find some crazy functionality mods for these Casio FX to unlock features from other models by scraping away some of the epoxy and shorting pins.
Looks like a lot of open unused space on the die, surprised they didn’t make more effort to shrink the die and get a larger yield.
I bet you'd love to have a FIB (Focused Ion Beam) workstation. Too bad they're so expensive.
Excellent
Is there enough detail of the ROM to get a dump of it? It'd be really interesting to try and make an emulator for this, and possibly trawl through the ROM looking for hidden functionality...
thats a tiny procesor, also does the epoxy have heat disipation propertys?
Not realy, but such a low power processor does not need it
Excellent, thank you.
Would you be interested in an LED bulb that burned out after 5ish years?
Would be cool running it with the heat from your hand .. though that's probably not enough, and would mean a very chunky other side
Dang. This one was goodest.
PirateKitty you meant “best”?
Is there any way to do one of 2 things to my (Casio fx-991MS or any other two-line Casio scientific), such as:
Giving it power-off memory safeguard (of the calculation history) after it auto turns-off;
Or, failing that,
Increasing the number of minutes before it auto powers-off (and erases my calculation history).
/Regards
How do u charge it
These are so cool. How is your lapping project coming?
It's not. On the back burner as I think about it more...
commons.m.wikimedia.org/wiki/File:CASIO_fx-92_Collège_2D_integrated_circuit.jpg
Here is a die shot of another calculator, the Casio Fx 92 college 2D+, which has a "natural display" it displays calculations like in a textboook on a 96×31 pixel dot matrix display. (it looks like that: www.mathematique.org/uploads/6/1/8/1/6181325/8185036_orig.jpg ) It has an OKI ML610901 chip with a 500KHz 8-bit CPU, 96KB of ROM and 3584 bytes of ram
the rom should be 5 kilobytes
The 3rd edition of my favorite pocket calculator. In my opinion the cases kept getting worse. Second one feels cheaply made and the Solar II feels like a toy.
Please avoid EEVblog references. Kids watch this channel and need to be keep away from dangerous, toxic places like that. It probably puts people affected by misogyny off too.
I don't understand? Do you mean the videos, are dangerous and mysoginistic? Can you give references, I don't come away with that impression myself.
He is just being silly I think.
yeah EEVBlog is pure evil - LOL
The videos are sometimes misogynist, e.g. the "in like Flynn... Eroll that is". Sometimes racist too, e.g. the "Won Hung Lo" comments. The forum is full of toxic people and Dave himself has doxed people in the past. It's definitely NSFW or kids and adults should be careful to protect themselves and their personal information.
Still not sure if serious...