Yeah I know, the zip drives are obsoletes, but I got one of these today and I wanted to try it on my laptop, unfortunately the zip drive uses the parallel port and my laptop doesn't have one, so I used my desktop PC (which has a parallel port). When I had connected the drive into the computer, nothing happened, so I started to search in the web and I found that if you want to use the iomega zip 250 drive with linux kernel 2.6.x, you must load the follow modules:
#modprobe parport_pc // This should load the driver for parallel port
#modprobe ppa // This is the older module could work for older drives.
#modprobe imm // This is the newest --> I used this one (besides the parport_pc)
And that's it. Then you load these modules you will be able to use your zip drive on your linux box.
PS: If you found any error in my English, please tell me!!