I've tried to boot an openbsd based livcd (bsdanywhere43-i386.iso) and netbsd based one (jibbed-LiveCD-0.15.72.iso) with qemu but they both fail as the kernel hangs as it can't find the root filesystem.
I'm using the following command to boot:
.\qemu\qemu -boot d -cdrom ..\..\Downloads\bsdanywhere43-i386.iso -L .\qemu
here is a screenshot of openbsd:
and netbsd:
I've already checked both checksum and they are ok.