I'll need to start dissecting those eActivities. Need to go find some because I deleted all of them from my calc. Links to apps would be pretty cool. Maybe they even provide args to the apps to open them in a certain way.

There has been some discussion in the IRC channel about file formats that could be used for potential shells. Fishbot and I have been working on formats separately for a while. I've started writing down the details of mine on a wiki sub-userpage:

http://wiki.prizmwiki.co.cc/wiki/User:JosJuice/File_stuff

If you're wondering how something is supposed to work, or why it is in a specific way, feel free to ask.

@Goplat, there are several issues with the current g3a format.
1. The header size is over 29kb
2. There are checksums included which can be difficult to calculate
3. g3a files are accessed from the main menu and are treated like apps.
4. There is extensive startup and exit code that must be included with every program
5. Running from the main menu does not support the use of additional libraries (MirageOS, DoorsCS7, Ion)

besides, the Prizm file system follows the standard folder system used on desktops. That is why it is so easy to transfer files. Unlike on the 83+ you can load any file extension into memory. For example I have a copy of my Prizm emulator on my Prizm. Of course it doesn't do anything because it is exe format, but it just seems funny to me

And for the shell format. I did create my own last night, but some edits need to be done. In an irc conversation I had with Qwerty, we determined that variable sized icons were the best choice to have. Here is the current format. You may notice that in the beginning of the header there are several flags that can be set. We are currently not able to accommodate support for all of the flags yet, but we should be able to later. Other features are a null terminated string for the program description and a 64x64 8 bit icon to be replaced with one of variable size, but not yet sure if it will be 16 bit, 8 bit, or variable bit yet. I do believe that it is possible to create an extension icon in the OS for files. For example in the memory manager, g3a files always show up with the geometric shape icon.  .org $30002000
data.l $xxxxxxxx   ;header for shell   
data.l $00000002   ;size of executable
data.b $01         ;true if MMU is to be reset
data.b $03         ;speed setting, 0-3
data.b $00         ;true if interrupts are to be disabled
data.b $01         ;true if fpu interpreter is to be enabled
data.b $01         ;true if all general purpose registers are to be cleared before execution
data.b $01         ;true if VRAM and screen are to be cleared
data.b $00         ;true if executable space is to be cleared
data.b $00         ;true if to begin execution in priveleged mode
;next 176 bytes are to be used for future expansion
data.l $00000000,$00000000,$00000000,$00000000,$00000000,$00000000,$00000000,$00000000,$00000000,$00000000,$00000000,$00000000,$00000000,$00000000,$00000000,$00000000,$00000000,$00000000,$00000000,$00000000,$00000000,$00000000,$00000000,$00000000,$00000000,$00000000,$00000000,$00000000,$00000000,$00000000,$00000000,$00000000,$00000000,$00000000,$00000000,$00000000,$00000000,$00000000,$00000000,$00000000,$00000000,$00000000,$00000000,$00000000
;next 64 bytes are for program description. Null terminated
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;256 color 64 * 64 icon
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data.b $00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00
data.b $00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00
;executable begins at $30004100
RST
NOP


Are you planning to try finding an exploit on the calc to run hacked files and launch ASM programs from there? I'm a bit lost here.

I think they're going to make a shell like Ion, which allows smaller, simpler files to be executed. Actually, I think Ion's original purpose was to allow compact asm programs to be run on the TI-83 (the Send(9 trick only worked on ASCII hex, which is twice as large)

Ah ok I see. But I thought Ion was pretty much like a regular program but with mixed BASIC and ASM? If you open ION.83p in SourceCoder it starts with Asm(prgmZION or something.

Would they need to find some sort of exploit that allows ASM code to be ran directly from a program or maybe even from another section? And what if no exploit is found?

They already have code running in add-ins, I think. So they'll probably make the shell as an add-in, which in turn will load other assembly programs directly from files.

But I think above they mention they don't want to use g3a format, which is basically an add-in, to save 29 KB of space (the header).

Oh, well I thought they were just saying that g3a would be really clunky for shell-based programs (which there could be dozens of on the calculator). I think there wouldn't be a huge problem with one .g3a, the shell itself.

What we are still working on is how should we design the header for the shell. Because once we release the format you can't make major changes to it or else it will break compatibility with older programs. So basically we have to get it perfect the first time because there is no going back. Thats also why in my format I included expansion space where new features could be added later.

I tried to design mine so that old shells can run newer programs if the programs don't use non-supported features (but if they have stuff like an extra icon, they'll still work fine but the extra stuff won't show up). I added a note about it on the wiki page.

What I still want to do is treat libraries as separate files from the shell. That way an older shell can upload the libraries from a newer shell and use that to run newer programs. Think of it like MirageOS uploading the DoorsCS7 libraries that way it can run programs that make use of those libraries.

What do you mean by "uploading" libraries? It would be nice if libraries are included in the shell .g3a but can be exported by the user to a library file if necessary (or the library file could be included with the shell .zip).