Originally posted by bousozoku
You're probably better off to look for one of those USB expansion modules that fits on the top of the tower and has serial ports and an opening for either an IDE floppy or Zip disk. I've forgotten the name but if you'd like, I would be willing to look for it. While you could find a floppy to fit in place of the Zip drive, you'd still have to find a way to connect it and that's still USB.
I have a G3/400 that I upgraded with a PowerLogix G3/800 processor upgrade and I'm quite pleased. I considered that the raw speed upgrade was far more beneficial than the small amount of AltiVec code available, so I did not buy a G4 upgrade. Why run at 550 MHz 85 percent of the time instead of 800 for the other 15 when it goes somewhat faster? 😉
Maximum RAM and a faster hard drive/controller combo will make it seem much more acceptable.