qemu is not liking RAW images, or complaining that the type of emulation is not specified.

[kq6up]

qemu-system-i386 -M isapc -m 16M -hda "$DISK" -no-reboot -net nic -net user,hostfwd=tcp:127.0.0.1:2023-:23 -vga std -monitor vc -fda "$FLOPPY" -rtc base="1996-01-01" -boot once=a -hdb fat:"$FATDRIVE"
WARNING: Image format was not specified for '/home/chris/sls/floppy.img' and probing guessed raw.
Automatically detecting the format is dangerous for raw images, write operations on block 0 will be restricted.
Specify the 'raw' format explicitly to remove the restrictions.
WARNING: Image format was not specified for 'json:{"fat-type": 0, "dir": "/home/chris/sls/slsfat", "driver": "vvfat", "floppy": false, "rw": false}' and probing guessed raw.
Automatically detecting the format is dangerous for raw images, write operations on block 0 will be restricted.
Specify the 'raw' format explicitly to remove the restrictions.
qemu-system-i386: Block node is read-only