Finally, you can make good use of available USB upstream ports on your PC , and free-up the parallel port for devices like your ZipT drive. Use the USB to Centronics 36 male adapter cable to attach your legacy IEEE 1284 bi-directional printer, and forget the hassles of IRQ sharing. That's the beauty of USB. The CTG USB to Parallel adapter cables are fully compliant with the USB specification ver. 1.1, and support standard PC parallel port register based operation.