Yep, I managed to find my old WindowsXP laptop and got a USB to serial cable and managed to hook it up to ProntoEdit4 and it communicates (uploads & downloads) fine. When I reboot/reset it does the double beep. Everything seems to work, the physical buttons all cycle through my CCF files correctly. Its only the touch screen that doesn't seem to register any presses. I've even downloaded back the original factory default CCF file and its all there, but the touchscreen doesn't respond. I wonder if the pin in the orange connector ribbon (YouTube videos on reviving TSU-3000 models) to the touchscreen would work for this model?