/usr/local/qemu/bin/qemu  -m 512 -fda ./vmm.img c.img

-m 512 = 512 MB RAM

-M = machine type

-cpu = CPU type

-monitor `tty` gives access to a qemu console that lets you dump
memory, registers, disassemble, etc.  It's not a complete debugger,
thoough

-s waits for a gdb connection.  This seems to only work for kgdb and linux kernels


-serial stdio redirects COM1 to stdio