Earlier models of the Iomega Zip drive used an external parallel port connection, as opposed to the later drives’ USB and Firewire connections. You can convert the parallel port to an USB connection using a parallel-to-USB adapter. Several companies make this type of adapter, but all work in a similar fashion. Put the adapter on the Iomega Zip drive, then connect it to the USB port. Writer Bio

How to Connect an Iomega Zip Drive With Parallel Interface to a USB Port on a Computer - 62