We do lots of converting from TTL serial to USB (using the FTDI and Silicon Labs ICs). But what do you do if you've got a laptop and need serial? This is a high quality upload/download wires use USB to TTL . Device uses the IC PL2303HX. Driver support for Windows, Mac, and Linux RedHat.
Also include 3.3V - unsoldered. Open the casing and solder one cable to use it.