User nigel@ind.tansu.com.au says:
> ...
> > intvid0 at obio0 @ f9001000: DAFB video subsystem, monitor sense 0
> 
> 	I'm not sure, but shouldn't the monitor sense have changed?
> The "doctored" motherboard should have changed the default monitor
> sense (which I assume is ID 0) to the extended sense code for VGA
> (10?).

Good clue, I wondered about that also. The original sense for a 575 should
be 6 I THINK (going by the HW30 doc). If the reported sense is inverted, that
would be 1. Anyway "1" is what I USED to get before the mod...

intvid0 at obio0 @ f9001000: DAFB video subsystem, monitor sense 1
intvid0: 640 x 480, 65536 color
 
> 	I suspect that the DAFB driving code is assuming that a 575
> will only ever drive a 640x480 screen.

I suspected that as well. The sense did change from 1 to 0. I THINK it should
have changed from 6 to 23 decimal. It may be that the driver simply
doesn't report the extended sense correctly (can someone out there let us 
know if they get extended sense codes on their dmesgs?) If it's just a
reporting problem then I assume there is a bug in the driver that is producing
the "split" screen.

> 	I think it gets this from the environment (i.e. the Booter
> passes in what MacOS was using), but it doesn't necessarily match
> what the video driving code can do on that machine.

Maybe I'll play with the machine ID to see if that changes anything...

Bob

-- 
Robert E. Brose II    N0QBJ
http://www.jriver.com/~bob/
bob@kunk.jriver.com