This article is from the the Brief Linux FAQ (BLFAQ) Maintained by Neil Zanella firstname.lastname@example.org
Get a bunch of floppies (one might be enough) and use:
$ tar cvMf /dev/fd0 <file/directory to be archived>
move the floppies to the other PC's floppy drive and do a:
$ tar xvMf /dev/fd0
Alternatively you can use the "split" command to split your file into many files of a particular size with the "-b" option, copy them to a floppy with a DOS file system with "mcopy", move the floppies to the other PC, copy them to the hard drive and redirect the output of "cat" to merge them.