Setting Driver Options - Planar DOME Md4/PCI Installation Manual

Installing the Md4/PCI Board in a PC 43

Setting driver options

The Driver Options area of the DOME tab enables you to
select these options:
• Disable DirectDraw
• Single-channel Grayscale
To disable DirectDraw
DirectDraw is an Application Program Interface (API) that
allows direct manipulation of the video display. To disable
DirectDraw, select the Disable DirectDraw option in the
Driver Options area of the DOME tab.
DirectDraw applications expect the screen to be repre-
sented as a single element. If you are using one Md4/PCI
board with multiple screens, or multiple Md4/PCI boards,
more than one screen can represent the desktop.
With multiple displays representing the desktop,
DirectDraw applications cannot access the entire
desktop and may not work properly.
DirectDraw limited screen size
Under the Windows NT 4.0 operating system, Build 1381,
DirectDraw supports only screen sizes up to 2048 x 2048
pixels. DirectDraw applications may not function properly
with larger screen sizes.
Microsoft is aware of this problem and plans to correct it in
a future release of Windows NT. Although DOME has
made efforts to provide whatever support possible within
this limitation, DOME cannot ensure DirectDraw compati-
bility with either multiple screens or a screen size greater
than 2048 x 2048 pixels.