We tried to install a debian 2.2r3 on a powerpc oldworld, but it looks to have 
an interlaced screen. 

First, it does not boot on cd (pressing 'C' during reboot), so we put the 
neccessited kernel image, and so on, on a floppy. 

It boots (the penguin appears), and after 20 seconds, we see for just a half 
second the beginning of the lines of the booting session, but then, the screens 
becomes completly zapped, with only dazzling lines; somebody told us that it 
was because 'the screen was (or was not?) interlaced': it is an original Apple 
screen (with the strange-non compatible plug). 

So, we tried to get in the open firmware, with a small Macos extension we had 
there, and it asked us to set plenty of variables we don't know about, more 
simple of them were number of lines and columns, and what kind of boot floppy 
we wanted to create (this was still under MacOS 8 or 9). 

Does anybody have an idea of the solution? 

It looks to be an Openfirmware problem and not installation (we didn't went 
that far), but it is still related!

Thanks in advance. 

Raphael


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