The Vidi-Amiga 12 is a video digitizer which connects to the parallel port of the Amiga. It is capable of capturing realtime video in 16 greyscales, or colour stills at up to 4096 colours (HAM-6) from either a PAL or an NTSC source including SVHS. An absolutely still image is required for colour grabs, because the red, green and blue components are captured independantly then overlaid within the software. Fast processors not only improve the speed of the capture but increase the tolerance of a bad quality video source. Early models were supplied with a separate power supply, however the later models also connected to the floppy drive port for their power source.
Please see the Vidi-Amiga 12RT and Vidi-Amiga 12SV
Thanks to Peter Gordon.