Macintosh Display Card 8•24

The Macintosh Display Card 8•24 (sometimes called the Macintosh Display Card 670) is a 12″ NuBus video card compatible with most 680×0-based NuBus Macs, with the exception of the Centris and Quadra 660AV models. It was introduced in March 1990.


Macintosh Display Card 4-8 and 8-24The 8•24 is an unaccelerated card, but it supports NuBus slave block transfers, so it will benefit from the installation of an 8•24 GC card as a second display card. The 8•24 supports standard Mac resolutions from 512 x 384 to 1024 x 768 in 24-bit colour (16 million colors) and 1152 x 870 in 8-bit color (256 colors). The Macintosh Portrait Display and Two-Page Display are supported in 8-bit grayscale.

There is no support for 16-bit color.

The 8•24 video card does not support resolution switching on the fly and requires a video adapter to support different resolutions on a multiscan display.

Revision B cards add support for 832 x 624, which the original card did not support.

The Display Card 8•24 requires System 6.0.5 or newer and 32-bit QuickDraw or the 32-bit QuickDraw Patch File.

This Mac video card can support a special resolution of 704 x 512, and then only on certain Apple 640 x 480 displays and with the shareware MaxAppleZoom control panel – although the control panel has apparently expired. (It was last updated in June 1993.) I have seen one recommendation for using 672-pixel mode with the 12″ Macintosh Monochrome Display.

Further Reading

Keywords: #nubusvideo