Re: AGP or PCI Important.

A little important point

really, I "understand" that AGP gives a faster DMA than PCI,
sorry, I am not experienced on this things.

Carlos

"Carlos CZ" <raulxynwDeleteAllThis@xxxxxxxx> wrote in message
news:ehoCFwCdGHA.4312@xxxxxxxxxxxxxxxxxxxxxxx
Hi Paul

No, my book isnt actual, its a book I bougth more or less in 2000 year,
perhaps my real fault is to read my book wich is from that year.

But the essential point, are not the AGP or PCI slots, those are very easy
to understand, but the fact that the PCI controller could to be
completelly
replaced
by an AGP one. Further, this AGP is called "the Set AGP", and it connects
this way

Pentium,
//
Phisical memory = Set AGP = ISA controller
// //
Slots Slots

as you see, no PCI. and there is a big difference, because data to the
physical memory directly. For this, it dont goes to Pentium first. this is
why I wonder, why to keep AGP
reduced only to video system ?, but I shall think on that later.

thanks, Carlos.

<paulmd@xxxxxxx> wrote in message
news:1147239665.395906.164330@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

Carlos CZ wrote:
Hi all again,

Finally I finded the root of my contradictions,
what happened is that my book only show two posibilities:

* or you use a PCI bus controller,
* or an AGP bus controller that replaces completelly the
PCI controller, yes, there is no PCI here.

If this is in an actual textbook, someone needs to have a chat with the
author.

Most machines have an AGP slot, but there's no requirement for one. Or
at least one PCI slot, which is also not a requirement, or the newest
ones have PCIe, and your old 286s and 386s will have an ISA video card.
Yet another option is having the video integrated into the motherboard.
And old macs used nubus, so this discription given is woefully
incomplete.



actually, I believe my motherboard uses a scheme like the one showed
in picture 7.7 of the Mike's link, wich is clearly a different
approach,
and
seems to isolate the AGP mechanism to the video system, leaving the
rest
connections to PCI ( I wonder why to keep PCI, but this is secondary
item ),

Because PCI is useful for other kinds of cards, audio, ethernet, modem
and so on.

but well, I need some time to understand and verify things related.

thanks and have a nice day, Carlos.





.

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