Ha, funny! I did something very similar when we moved from old NEC APCs with 8" floppies to brand new IBM PC XTs and ATs! The consultants wanted something like $200 per disk to convert them. I was able to rig up a serial cable and a tiny Turbo Pascal program to send files from one machine to another. A couple cheap cable ends from Radio Shack and some spare phone wire from the basement was all it needed!

The serial printer port trick is very clever too. I don't think my transfer was as fast as 9600. Good job!