Hmmm... You've got me thinking, and I don't know if this'll work, but see if you can follow me and give this a go:
Boot up with Knoppix, mount up any given partition at /mnt/fat32, then:
dd if=/dev/cdrom of=/mnt/fat32/knoppix.iso
Once that finishes:
mount -t iso9660 -o loop /mnt/fat32/knoppix.iso /mnt/knoppix
(eject the disk by CTRL ALT F2, eject, and put in the blank)
I don't know if that'd work, and you will surely have to tweak some of those directories, as the root of the knoppix CD is (I don't think) actually setup as a / partition.
If I've confused you, or this is all 'latin' to you, don't worry about it, and just disregard.
If you've got a floppy drive, I strongly suggest looking at one of the floppy distros:
Or just search on google.com/linux for "floppy distro"