I chose to do an EPQ on the subject of designing an instruction set architecture for a hypothetical custom CPU, implementing an emulator for it, then taking that a step further by writing an assembler and a small OS for this computer. The emulator is for a system with a screen - an X11 window, and a keyboard - X11 keycode input.
My OS can be found in src/source_files.
Please see the lengthy technical specification document for a (hopefully) comprehensive explanation of all the code in my project. The original Git history and a brief explanation of changes in each commit can be found here.
On a Linux computer with Python >= 3.10, and X11 windowing system:
cd src
./build.sh
./run.sh
The init system, which is the first user-mode program loaded after the kernel, accepts and displays keyboard input at a prompt. When the enter key is pressed, it treats the input as a number and prints all primes less than or equal to that number. If no input is provided, the computer terminates.
