I once was coding in school and my batteries died. I was so desperate I bought the ones from my friend's 84 for $10.

very true. after all, if you have a game like Jump! on your calculator on that speed, you'd likely need to carry around a bag full of batteries(not that most of us don't carry around extras anyway)

EDIT: also, another worry is the LCD. that could break if you push it too hard.

You don't carry an extra bag of batteries with you!?                     
but yes you would have to watch out with the LCD. On the 83+ there was a minimun amount of time you would have to wait before redrawing to the screen.

Dear cunstomer,

Thank you for sending e-mail.
Also we would appreciate for your interest in Casio new scientific calculators.
However we regret to say that Casio has no schedule for disclosing the details of file format and releasing Software Development Kit for Prism as for now.
Your understanding would be highly appreciated.

Best regards,

Well I thought it wouldn't hurt to send an email to Casio Japan asking if they could provide some help on the file formats, but they're not interested. I probaly send a reply to convince them to give up some information. Otherwise on the app format I have just one last part to figure out, the 16 bit checksum. Doing some further research it probaly uses an algorthim known as crc-16. The difficulty with this format is that if your just off by one byte you get a very different answer. I was going to write a C++ program to test every possibility, but it turns out it would take my computer about 20 years to calculate this 

I was a little dissapointed by Prizm Basic. Pure math wise it is a little faster than the 83/84, but any screen drawing is very slow. The locate command is actually slower than than output by about 25%. The f line and vertical/horizontal commands are also slow, but the worst is pixel drawing. Just to draw a pixel line across the screen took me over a minute. Its not all bad though. There are many advanced string manipulation commands avaible such as all caps/lowercase, but I'm not sure how useful they will be. Probally the best feature though is the Prizm's ability to convert programs into txt files and txt into programs.

The Casio Prizm is going to bring a new era to calc development. Its biggest feature being the 216x384 16 bit color screen. This as many know will expand the possibilities of what was previously thought possible on a calc. No longer will we be restricted to low resolution monochrome screens. As a result a list of what the community wants to accomplish throughout the next few years will help serve as a guide to developers. 

TI 83+/nspire emulator: There are many great games currently on ticalc. Porting them to the the Prizm will take a long time and will be impossible for some games in which the original source code has been lost.  An emulator will be a difficult project to achieve though. All the ports and hardware would have to be emulated properly to allow games that use grayscale and acsess the archive and usb port to run properly.

Overclocking: Hopefully the Prizm can be clocked far past 29mhz in software. If overclocking requires physical alteration of the calc many people will not be able to enjoy games that utilize that ability. If overclocking is done care must be taken to ensure that other people's calcs are not damaged by malicious code.

Axe: After running several tests Prizm basic seems quite slow. This is most visible in any form of drawing operation. Therefore Axe will need to be ported to the Prizm allowing great games to be written much faster (both actual time to write code and speed)

Archive: The current restraints of 16mb of archive put a limit on future development. External archive additions will need to be created to open up more possibilities. Doing this though will require great knowlege on the Prizm's ports and usb protocols.

Video: This could be the first time we see real looking video on a calc. The proc seems fast enough to support it and the screen has a high resolution with 16 bits of color. The only modification needed will probaly be more archive space.

Wifi: Using this could open up many paths for development. Users will be able to connect from much farther than 3 feet away on a cord. Imagine playing a 2 person version of Phoenix on your calc with someone thousands of miles away. We could even make omnimaga accsessible from your calc.

author=graphmastur link=topic=5966.msg105395#msg105395 date=1293858085]
I'm pretty sure we could run it with just the OS.  I don't know how picky Casio is with roms, but I'm sure it will be alright for personal use or something like this. Now, we need to be careful to see any signs of no-hacking policies. I don't like messing with stuff where it could be legally bad, and wouldn't write an emulator at all in that case.  Does anyone know of a disassembler for the SH3? Or at least an instruction set somewhere.

I couldn't find any disassemblers that worked for the SH3, but there is a full documentation at http://documentation.renesas.com/eng/products/mpumcu/rej09b0317_sh_3sm.pdf using that I'm someone will write a disassembler tool allowing us to document ports, memory, and system calls. As for the rom it should be legal as long as you use one from your own calc.

Anyone who uses ASM for this will never need to use RAM with all. There are 24 general purpose registers alone, even if you can only access 16 of them

Nice, that's much better than the z80 at least. The 83+ had like 8, right?

Also, I hope that if Casio ever releases Prizm documentation that it won't be translated from Japanese to Zero Wing language...

And those 8 the 83+ had were 8 bit registers. The Prizm's 16 are all 32 bit.