Re: AGP or PCI

Carlos

Look at the diagram 7.7 in the article I sent to you.. the bus coming from
the CPU splits into the PCI bus and AGP bus via PCI and AGP controller
respectively.. they are not one and the same, hence the different names..

--
Mike Hall
MS-MVP Windows Shell/User



"Carlos CZ" <raulxynwDeleteAllThis@xxxxxxxx> wrote in message
news:%23KBRPGEdGHA.4428@xxxxxxxxxxxxxxxxxxxxxxx
Further, I am not saying AGP bus, but AGP bus controller, as in the
figure.
Of course, the bus should must be the same, no need to call it PCI or AGP.

Carlos
"Mike Hall - MS MVP Windows Shell/User" <mikehall@xxxxxxxx> wrote in
message
news:OgtRIqDdGHA.1856@xxxxxxxxxxxxxxxxxxxxxxx
Carlos

The PCI bus CAN NOT BE REPLACED BY THE AGP BUS.. the AGP bus is GRAPHICS
ONLY..

AGP is an acronym for ACCELERATED GRAPHICS PORT

--
Mike Hall
MS-MVP Windows Shell/User



"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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