I need an adapter to convert 9pin connector to usb...I ordered the kit to download updates to my HB only to find out I have to have another cable with USB connector.

.. I'll have more in the PC stuff than in the Depth Finder.
I don't have but one 9 pin port on the back of my tower & my printer is connected to it..
Where can I find and adapter & how much are they?
Thanks....
PS: I just bought this unit & it is already outdated....