Archive of the J Operating System by Terry A. Davis:
jcd.isowas downloaded from https://web.archive.org ,JCD.ISO/contains uncompressed the contents ofjcd.iso.
To run jcd.iso in QEMU, install qemu-system-i386.
Next, start QEMU with qemu-system-i386 -cdrom jcd.iso -m 100. In the JOS boot loader screen, press s for seconday IDE controller, followed by 0 for IDE master:

To boot QEMU with a hard drive, run it with the following options:
-drive file=JHD.raw,index=0,format=raw,media=disk -boot d
after creating a JHD.raw HDD image with:
qemu-img create JHD.raw 500M