This is neat, of course. And it also goes back to old Commodore 64 (and before) days of using audio for data in/out, including mass storage on audio tape.<p>I've always been bothered by Apple and the other tablet maker's choice not to include an openly usable simple serial port on their devices (or the ability to use a USB<->serial adapter). I understand the Apple "control everything" mentality. Their sandbox, their rules. Still, I can only imagine how neat it would be if all of these devices had a simple two wire serial port available without limitations. As a result of this we have to go backwards in technology by some 30+ years for simple little projects.