A pre-built floppy disk image can be used. Rawrite can be used to put the floppy image file onto a floppy. It is formatted with FAT-file system with a number of reserved sectors at the begining. Modern operating systems like Windows XP can usually read the floppy. There is a default rdos.bin file on the floppy. It should be replaced by an OS image file created with CFG2BIN.