At 3:08 AM -0400 4/6/99, bob@kunk.jriver.com wrote:

>That sounds possible. I just did some testing...
>
>1) The color depth doesn't matter, 8 or 16 bits the text screen fouls up
>   either way
>2) Checking or Unchecking the video hack box results in a physical
>   address of F9000000 from 51900080 for the hack and an
>   address of F9000080 from 51900080 without the hack
>3) the dmesg says intvid0 at obio0 F9001000 DAFB video subsystem monitor
>sense 0
>
>Everything looks ok up to and including that line (3) above, and afterwards
>the video start of each line is shifted to approx the middle of the screen.
>
>Do these addresses give any hints of the problem?

Ok, yes. We're reading an offset of 0x1000 from the video controller. I
remember somebody else
had a problem with their LC475 not working with the offset as well.
Apparently the controller
in the 475/575 is different enough so that it doesn't work correctly. It's
supposed to be a type 5
DAFB-style controller but I had somebody with a 475 return a type 7
controller. I don't yet know
how to deal with type 7 controllers and they are apparently different
enough to cause problems.

I'll have to investigate this more.


_______________________________________________________________________
 Michael Zucca - mrz5149@acm.org - http://www.mdc.net/~mrz5149/
 "I will choose a path that's clear. I will choose Freewill. "
  --Rush, Freewill
_______________________________________________________________________