Planar Dome C3i/EX User Manual page 27

To emulate a PseudoColor visual class
Start the X server using PseudoColor as the default visual class by
adding defclass PseudoColor to the openwin command or to
the Xservers file.
For example, for a one-headed system using the DX2 board, type:
openwin -dev /dev/dx2pci0.0 defclass PseudoColor
For a two-headed system using the DX2 board, type:
openwin -dev /dev/dx2pci0.0 defclass PseudoColor \
-dev /dev/dx2pci0.1 defclass PseudoColor
To check the default visual
Use the xdpyinfo command to check the default visual of a screen.
Look at the correct screen and find the visual with the matching ID to
verify that it is PseudoColor. (See page 18.)
When used on a color display, the TrueColor and DirectColor visual
classes default to using 24 bpp. All other visual classes, as well as all
visual classes on a grayscale display, default to using 8 bpp.
Installing the Display | 17