yes to the second edit.

nice find.

Software will be splited in at leat two modules. ( Some others modules that i thought will be added later or optionnal ).

-Math engine
-Gui system.

First, we have to code the math engine.

It's gonna be in shell like this :

$mathenginename "code or math expr to exec" -options
=> output standart "Results".

The math engine writed in a C++ code, and is fully object oriented.

you can redirect input and output standart to files in linux easyly
So Gui will use files or memory to I/O for access to the math engine.

But before evrything, it would be awesome to design a web site for sharing our work, roadmaps, ..., and find other people.

& Coordinate work.

You might want a lighter OS though I do like debian it is heavier then I'd want on a calculator. I'd be glad to help on these projects if you can set up a QEMU instance for me to work with. ARe you going to try to make this SAT compatible? You have to do that to get real adoption of it in schools. Especially with debian you'd want more RAM to run much. The best thing would probably be a custom linux distro. With your specs it cannot run most packages for debian but you could build and set up a package system(I'd say see sabayon/gentoo for good ways to do that) that people could download(I think an msi like format that installs itself would be best). Also for batteries you are going to want at least 2 days of active use to make it usable. That would be a 19200mAh battery. This is a great idea but you might want to work through it a little more.

It's a lighter Distro of linux based on debian. It's sold with the CPU. I've checked that.

You'll not able to run all packages, that's sure. But the aim of this project is to do the most compatibility.

The thing that i'm only a bit worryed, it the screen driver. I can make a lib to use the screen, but i would like the system to understand
if you don't start anything else that just the os, that it should use the screen I/Os for standart output. ( And not the Hdmi ). So
i've to write a screen driver, and i admit not being an expert in linux, just a good user.

That would be far more usefull that the os know there is a screen instead of writing a lib to use the screen in the math gui.

Oh, and if you make a rechargeable battery, please allow it to be removable.
I ripped my nspire battery wire trying to take the battery out.

It's not the hardest thing to too. So, in time we'll see to do it. 

Hello evrybody,

Let me introduce myself, i'm a french student,
in my 4th year of engineer in electronics, micro-electronics, & robotics.

I'm 28 ( yeah i know i'm old because i re-started my studies ^^ ).

I know how hard can be this kind of project, so it's not usefull to say,<< it's too hard stop & let ti and casio rape our wallets   >>

I estimate this to a 2-3 years project.

-Hardware : I've found a board near the one i'll design. So i can make it even cheaper, and we can have prototype board for 89$
-Software : hardware is running LINUX ( DEBIAN DISTRIB ) so it's easy to write code in C++. I know there is Xcas, but i want do something different. ( i'll explain for people involved ), and IDE will be QT !!!
-Case & Battery : It's to early to think about that, but it's know to be difficult to do a good design, and get a low power consumption

I started this project 2 weeks ago on tiplanet : http://tiplanet.org/forum/viewtopic.php?f=33&t=10640 ( in french ).

I thought to doing it for 2 years now.
Now, it's time because i have the skills to do the hardware. ( I've made my first analog integrated circuit 3 months ago ).



So want i really need ?

-C++ coders.
-Math Teachers
-Designers.
-hardware experts, could be usefull too.
-website designer
-evrything else that could be usefull.


So the main advantage of this Calc, will be : C++ coding and near ASM speed. Access to all build in math libs.

I'm thinking to do multiple hardware with multiple cost. The first one, will be the cheap one. I think to do a ultimate product too after,
with same software.


---------------------------
A litle FAQ :
Q: Does i need to send money or something ?
A: Just use your skill with your keyboard that's enough.

Q: It's nice, how i can invest myself ?
A: Start to send an answer to that thread here and write your skills ( all skill you can offer, even it's not asked ).

Q: It's wonderfull, but i don't know anything of design, or C++ coding, What can i do ?
A: There is easy start of C++ on the web, and there is other stuff to do, so write your skill, ... in worst case you can order chinese food. ( we have a pizza french man  )

Q: Will i see any benefit of my work ?
A: For moment i'm thinking to use creative commons licence for source. There is no doubt there will be prototypes. So evryone involved will get an access to get a prototype for the build cost. And if the calc sell well i'll see to share any benefit, don't know how, it's too early to say.
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I also expect all your feeling about my project.