I have a Compaq 3000 laptop. I bought a IO Gear guc232a usb to serial
converter to upload my volkslogger. It didn't work. I then bought a
usb to serial converter from Purple Computing (the guys who have garmin
plugs for sale). If you don't use the highest speed (115k) it works
reliably for up and down loads of a volkslogger. I've never tried to
load an SN-10 but I think it would work. I'll try to find an SN-10 to
prove this.

Dan
High Flights Soaring Colorado Springs