Fully tested, original Apple Display Card 4•8 12" NuBus video card.
It is not compatible with the Centris/Quadra 660AV but can be used in any other Macintosh with NuBus slots. The 4•8 is an unaccelerated card supporting standard Mac resolutions from 512 x 384 to 1024 x 768 with 8-bit colour (256) and 1152 x 870 with 4-bit colour (16). The Macintosh Portrait Display is supported in 8-bit (256) grayscale and the Two-Page Display is supported in 4-bit (16) grayscale.
The 4•8 video card does not support resolution switching on the fly and requires a video adapter to support different resolutions on a multiscan display. It requires System 6.0.5 or newer and 32-bit QuickDraw or the 32-bit QuickDraw Patch File.