> > The X clients are working "out of the box"; I just don't know how to
> > configure the X server.

My dmesg says:
newport0 at gio0 slot 2 addr 0x1f000000:
 SGI NG1 (board revision 5, cmap revision 5, xmap revision 5, vc2 revision 0),
 depth 8

After running xf86config I modified the XF86Config file to read:

Section "Device"
    Identifier  "NG1"
    Driver      "newport"
EndSection

Section "Screen"
    Identifier  "Screen 1"
    Device      "NG1"
    Monitor     "My Monitor"
    DefaultDepth 8

    Subsection "Display"
        Depth       8
        Modes       "1280x1024" "1024x768" "800x600" "640x480"
        ViewPort    0 0
    EndSubsection
EndSection

Now I'm able tu run startx with no errors but the screen is mostly
black, the xterm borders are green (with a bit of blue) and I can't
see what I type in an xterm though commands are indeed executed.

Can someone show me a working XF86Config file?

Regards,
Thierry.