@Norbert, post #2
@Norbert, post #4
@lef, post #5
dd if=/dev/disk4 of=amiga_hdd.img bs=512
./qemu-system-ppc -machine mac99,via=pmu -m 1024 -device sm501 -boot c -bios openbios-qemu.elf -vga none -device ide-hd,drive=hd-drive,bus=ide.0 -drive file="mos.img",if=none,id=hd-drive,format=raw -net nic,model=rtl8139 -net user -device ide-hd,drive=amiga,bus=ide.0 -drive file="amiga_hdd.img",if=none,id=amiga,format=raw