It looks like the tcx framebuffer is capable of supporting 24 bit
color, but a tcx framebuffer under netbsd will only support 8 bit
color.  (This seems to be true in 1.4, anyway.)

Is the tcx framebuffer likely to be supported better anytime soon if I
don't find time to write the relavent code?  What code does need to be
written to make it work?