Still Video Back SB-90S
The SB-90S, together with its sister model the SB-70S intended for the 7000 camera, were in a way the first digital SLR cameras from Minolta (they were first shown at Photokina in 1986). The Still Video system was a way of capturing the image electronically through a CCD, but storing the images in an analog way -- much like VHS, but the storage for still video were on small (two inch) magnetic discs, allowing 25 or 50 pictures per disc depending on quality. The SB-90S uses a 2/3 inch CCD with 380 000 pixels, has a sensitivity of ISO 200, and relay optics acting as a 2x tele converter. It has automatic white balance with manual settings available on a small LCD display. The 9000 thus holds the merit of being the first (and only until the digital back for the R8/R9 is released) 35mm SLR that can be used to capture both film and electronic images.
The Still Video system was unfortunately of too low quality to be really useful, and died a swift death with the advent of "real" digital cameras with higher resolution and digital storage. However, the SB-90S did herald the Minolta RD-175 digital camera, released in 1995 with a 1.75 megapixel final resolution.
As far as I know, there was only a NTSC (US/Japan color TV system) version of the back; a PAL (European) version was never released.