How to configure video parameters on Mandrake 9.1 PPC install

Hello everybody:

 I�m trying to install Mandrake PPC 9.1 on my PM
 8500/132.

 When I launch the installer, everything is ok but in
 graphical mode I get a divided screen with wrong
 colors.

 Somebody can explain me how to tell to kernel to
 configure video?

 What about that Video=atyfb:vmode:15,cmode:16
 parameters?


                thanks indeed.

                Moises H.


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