On Sep 20, 3:41 am, Austin Leeds <[email protected]>
wrote:
> While I know that the Pismo's VRAM cannot be expanded physically,
> I've heard that it is possible to change the AGP aperture for the
> video card. I've heard that it MUST be possible, but no one seems to
> know how to do it. Open Firmware is one possibility. I've heard
> something about a DMA. What does that stand for and what does it do?
> Does anyone here have any ideas about this?
Not sure what you mean by aperture. If you mean AGP 2X to 4X no. This
goes along with 64bit by 66mhz pci slots. So you would not get it from
a cardbus card either as that is 32bit by 33mhz. But Linux shows
something about the card could adress 16MB, that doesn't mean you can
redesign the motherboard unless there is an empty solder spot for it.
DMA means that data does not have to go through the CPU. The cpu tells
the graphics card where to grab/put data (and vice versa) and that is
that. Actually the data can be program code as well. But the old card
doesn't have much GPU capability. So the cpu must work on it too. For
the dvd player, there is an mpeg decoder chip somewhere, not sure if
that works in with other kinds of movies.
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