I want to connect an Apple Studio Display 21 to a PCI graphics card in my Power Macintosh G3 (Blue and White). I used the VGA style connector on the card but I don't seem to have all the Geometry and Color control that is available when the display is connected to the Apple video card that came with my computer.

Due to signal dependencies not present on the VGA style connector of most third party cards, you must use the VGA-to-Macintosh adapter to connect the display to the DB-15 video connector, if the card has one. The VGA-to-Macintosh adapter is included with the Apple Studio Display 21.

By using the VGA to Macintosh adapter and connecting to the DB-15 port on the card, the additional video controls become available for use. Be sure to connect the adapter to the card first, then connect the display cable.

Note: The Viewable Image Size of the Apple Studio Display 21 is 19.8 inches.