Well if I could figure out the protocol of the Polaroid Digital Palette (specifically the HR-6000 but the ProPalette and CI-5000S use the same SCSI protocol)...

Well if I could figure out the protocol of the Polaroid Digital Palette (specifically the HR-6000 but the ProPalette and CI-5000S use the same SCSI protocol)... Look for any debug data you can turn on in the driver and correlate that against whatever you see going to the scanner. Try to save timestamps if you can, then merge the two logs. I was a little surprised that while Polaroid had stripped the DLL symbols, they'd left a "PrintInternalState()" debug function which completely gave away the majority of the DP_STATE structure fields. After that, I reverse-engineered and reimplemented the DLL (it's a small DLL), swapped the ASPI side for Linux and wrote a tool that loaded a PNG file and spat the pixels at the reimplemented library. And then someone sent me a copy of the Palette Developer's Kit... (Incidentally I'd really love to get hold of a copy of the "GENTEST" calibration tool, which was apparently included on the Service disk and the ID-4000 ID Card System disks)