I transfer files like that. I have iMac 21" Late 2009 connected to USB 1.4 MB floppy drive. You will need PC Exchange on SE/30 Mac to write files to the Floppy. Floppy is DOS formatted so Mac OS can read/write to it.
I think it is nothing wrong with keyboard, it is probably the system you are using like US system has different key maping like International system. International had special keyboard layout control panel.