Well, just got an answer from Thomas Leitner in Austria
which works:
Steps which led to the 24bit TrueColor visuals:
o installed Open3D which I got from 
  
http://www.service.digital.com/open3d/swelsa_GLoria_Synergy.htm
o created directory /etc/dt/config
o copied /usr/dt/config/Xservers.con to /etc/dt/config/Xservers
o changed the X server line to:
   :0   Local local_at_console /usr/bin/X11/X :0 -bs -su \
         -screen 1280x1024 -vclass TrueColor -depth 24
  (which gives me 1280x1024 with vsync 75)
o restarted the Xsession by: /sbin/init.d/xlogin restart
  (it might be necessary to log in again and maybe
   again some /sbin/init.d/xlogin start)
o The output of `xdpyinfo' is now:
  [....]
  screen #0:
  dimensions:    1280x1024 pixels (280x236 millimeters)
  resolution:    116x110 dots per inch
  depths (2):    1, 24
  root window id:    0x24
  depth of root window:    24 planes
  number of colormaps:    minimum 1, maximum 1
  default colormap:    0x22
  default number of colormap cells:    256
  preallocated pixels:    black 0, white 16777215
  options:    backing-store NO, save-unders NO
  largest cursor:    64x64
  current input event mask:    0x58003d
    KeyPressMask             ButtonPressMask          ButtonReleaseMask        
    EnterWindowMask          LeaveWindowMask          SubstructureNotifyMask   
    SubstructureRedirectMask PropertyChangeMask       
  number of visuals:    2
  default visual id:  0x20
  visual:
    visual id:    0x20
    class:    TrueColor
    depth:    24 planes
    available colormap entries:    256 per subfield
    red, green, blue masks:    0xff, 0xff00, 0xff0000
    significant bits in color specification:    8 bits
  visual:
    visual id:    0x21
    class:    TrueColor
    depth:    24 planes
    available colormap entries:    256 per subfield
    red, green, blue masks:    0xff, 0xff00, 0xff0000
    significant bits in color specification:    8 bits
Thanks again to Thomas.
Holger
Received on Fri May 21 1999 - 14:24:43 NZST