Nothing is impossible. There is a version of ADT (pre-ADTPro) that runs on the classic mac. You'd need a printer cable (an 8-pin mini-DIN null modem, essentially) for that. If you have that cable, you could also do file-by-file transfers via a telecomms program on both ends - but I suspect that's not really what you want to do, since there's hardly any large-scale filesystems you can hook to a IIc+. You're basically restricted to the 800k floppy.