This video shows dreamos running on qemu.

Although there is not much to see, the OS screen is basically static (With few exception), a lot is running under the hood:

• Currently the kernel is scheduling between two tasks
• One task is the kernel idle, and the second one is a program running in userspace
• The program running in userspace is loaded from an ELF file (added as a grub module)
• The ELF file is a simple assembly program with an infinite loop that loads the same syscall.
• The syscall always print the same text on the screen: "Hello from user world through a syscall"
• Key press handling

The source code of the kernel is available here: https://github.com/dreamos82/Dreamos64/