I've been working on an add-in to do programming on the CG50. It has tabs like tmux, and each tab can be split once either vertically or horizontally allowing for up to 12 programs to run at once. Only the currently selected program runs until you switch to another tab or split. I think this will work better than the way the built-in Python does it where you have to save the file and lose your place every time you want to run something.


Each of the 12 splits has its own memory in the 2MB of RAM starting at 0x8c200000. When you start a program or move back to a program that's already running, the add-in shifts the memory for the selected program to the top of the heap so it's contiguous with the rest of the free memory and easy to expand.

I'm close to being finished with a simple shell so I can manipulate files without having to leave the add-in. Thanks to LephenixNoir for the help with file system operations and everything else. I plan to add a Forth interpreter next to write programs that run on the calculator.

I made a small framework with SDL2 for testing the add-in. It configures the video memory the same as the CG50 so writing a pixel there works exactly the same as on the calculator. It reimplements some of the gint functionality too so I can compile the add-in for linux which is very convenient for testing.

I'll add some more information as I finish more features. Please let me know if you have any suggestions! GitHub repo here.