This camera has 640×480 resolution with built-in memory and a serial interface, holding about 16 pictures. There is no USB nor memory card slot.
This camera was designed as Windows-only, with proprietary TWAIN drivers to talk to the camera over the serial port.
In my testing, the colors are slightly different in the gphoto output, compared to the Windows Twain driver output.
The Fun! Flash 640 is different from the PDC-640 and 640SE models. Web references for the Fun Flash 640 are hard to find in 2005. Most searches turn up information about the PDC model. I recommend GPhoto as the main resource for technical details.