An x86 assembly-based boot sector operating system that packs a shell, file system, and process management into 510 bytes
Runs in real mode: the 16-bit mode an x86 CPU enters first at boot. Can access only 1MB of memory and has no protection features
Supports small but core features such as running shell commands, reading/writing files, process management (cooperative multitasking), and running user software (included in bin)
Provides a demo that also runs in the browser, and includes a small SDK so you can write your own programs by following the tutorial
Can be tested locally with QEMU or Bochs
(Risky, but) can also boot on real hardware by writing the image to a device with dd