qemu needs some rom's, obviously.

usage: qemu-system-xxxxx -L ./pc-bios

created with:
tar czf pc-bios.tar.gz  pc-bios/*.bin pc-bios/*.rom pc-bios/*.fd pc-bios/openbios* pc-bios/keymaps

extract to /usr/local/share/qemu (move files from pc-bios subfolder).