Ok, I misunderstood your question. You can build a cable (see the FAQ) or purchase one. The cable for a Kodak DC 210 camera will work fine.
To hook the Pronto up to your computer you'll either need a serial to USB adapter or a serial port card IF AND ONLY IF your computer doesn't have a serial port.
A serial port card will only work with desktops, not laptops but is relatively cheap. Here's the one I use
[Link: newegg.com]. It works fine with my Vista 64 bit Operating System.