Bootable ISO (52 KB) and raw boot image (6 KB).
VirtualBox: New VM, Type Other / Version Other-Unknown, attach tinyos.iso to the optical drive, start.
QEMU: qemu-system-i386 -cdrom tinyos.iso
Boots straight into the VGA 320x200 desktop: launcher, taskbar with a live RTC clock, and eight apps including a shell, calculator, notepad, snake and a 7-segment clock.
Both artifacts are reproducible from source with make (nasm + python3).