I took the Bare Bones x86 C kernel tutorial from OSDev Wiki and improved on it by:
- Implementing keyboard input reading,
- Implementing typing on the screen w/ ASCII characters,
- Newline support and screen scrolling.
- Basic command interpreter
- Implementing terminal title
- Pseudo-random number generator
- A working text mode cursor
...which makes it a DOS-like command line rather than a poor 'Hello World'.
In the scripts folder are the commands you can use to build and run the OS yourselves. It is made to use GRUB as the bootloader. Or, merely take the prebuilt ISO file in the bin folder and boot that up.