Subject: Re: Missing Columns episode 12768 - possible solution ?
To: John Shardlow <jshardlo@london.micrognosis.com>
From: David Jones <dej@eecg.toronto.edu>
List: amiga-dev
Date: 08/08/1994 15:09:53
[ Re: missing columns ]
> I find it very interesting that the same problem exists on both
> NetBSD and Linux yet I experience no problems with the display
> when using AmigaOS.
>
> One of these days I'll get to the bottom of this.......
>
> John
Has anyone done the obvious here?
Can a debug msg be put into the kernel giving the physical address of the start
of the frame buffer? (More precisely: start of each plane, plus interleave
modulo) Then, using some kind of utility (I can provide
you a very primitive one), read the relevant portion of /dev/mem.
(Clear the screen, put some text in the upper left corner, then use the rest
of the display to dump the first 256 bytes or so of memory.)
The question: do the bit patterns in chip RAM correspond to what is displayed,
or not? If not, is there any pattern to the mis-correspondance?
I take it this is a stock 3000?
--
David Jones, M.A.Sc student, Electronics Group (VLSI), University of Toronto
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