Why doesn program `xyz work in 16bpp?
Several 8bpp programs don’t work on displays without a PseudoColor visual available. Several PC X servers don’t support PseudoColor visuals on displays running in TrueColor mode. You should buy an SGI. Or run two simultaneous X servers, if you’re on Linux. Note for SGI users willing to play with their bpp : One has to tweak the arguments to X in /usr/lib/X11/xdm/Xservers.