That's true, it might be useful to specify that mysterious 'DCU-60' is nothing but the dumb USB cable normally sold with almost EVERY SE handset and, if lost, could be found for peanuts on Ebay (which is what I myself did, and got along, believe it or not, the original SE cd !!!

For those interested, I might be able to find the vendor's address (which is in UK, as far as I remember)