Saddam was quite nasty, as it was able to force itself to load automagically when the floppy was inserted to the system (it replaced the disk-validator and then corrupted the disk intentionally, forcing the disk-validator to be load the instant the disk was inserted).
I have no proof of this, but I believe one motivation of moving the disk-validator inside the ROM was to plug this loophole. Naturally there were other reasons aswell, mostly the fact that you really shouldn't try to load the validator from the corrupt disk itself (rather bad design).
