It is a "U232-P9", 4 inches long. I believe they are manufactured
specifically for them. They also sell a 6 foot cable model, but for
the laptop, that's a bit much. link to them
is:http://pfranc.com/usb/usb.mhtml#drivers ; their new driver is
"signed" by Microsoft - I continue to use the older one that wasn't,
since it works. I've also bought their do-it-yourself Garmin plugs
twice, and have been satisified with the products.

The IO Gear usb to serial, bought at best buy in Colorado, is only
useful as paperweight (if the wind is low enough...)
Dan