I just ordered the serial cable for my ACjr so I can update the firmware. The issue is My laptop only has usb ports and the cable comes with a DB9 connector. Would I be safe getting a cheap USB to DB9 adapter or is there something to the $30 adapters that I am not aware of. The little adapters range from $1.00 and up. I just want to be safe, plus I am clueless with all of these adapters. I would hate to go thru with all of this and get snagged because of a crappy adapter.