I have a 2c+ and an Imagewriter I, but they don't seem to want to communicate. I don't know if I have the right cable. The one I have is gray, has an apple and a printer icon on it, and has the number 590-0556-A on the computer end. That end has 8 pins, the printer one has 6. Can anyone tell me if this is the right cable, and if not where to get or how to make the right one? Thanks. John