Can you post a small example that demonstrates this? Does it happen in different display sizes? Also, what specific graphics chipset is it?
I thought it might be related to this thing (which I think is the result of different display formats/pitches, but usually only seems to show up in 16-bit modes), but that does seem rather a huge difference, ie. $00000000 to $0000FFFF.
What results do you get back when writing something like $FF000000 or $00000001?
I thought it might be related to this thing (which I think is the result of different display formats/pitches, but usually only seems to show up in 16-bit modes), but that does seem rather a huge difference, ie. $00000000 to $0000FFFF.
What results do you get back when writing something like $FF000000 or $00000001?