agp slot/pci slot 1

[kamala]

Whats the deal with an AGP card and PCI slot 1?

Would there be a conflict? What limitations would a PCI card in slot 1 have?

Shouldn't the motherboard automatically assign irq's?

EPOX MVP3G2

[scotter]

some motherboards share resorces for PCI 1 and the AGP some do not,it's same for the last PC and first ISA,check your mobo manual or epox's web site for info on your mobo

[daryilha]

Does someone know if PC-Chips M577 motherboard has such compromise between PCI slot 1 and AGP slot?
I would like to add a video capture card and only have PCI slot 1 free. AGP slot is taken by Viper 550.
Thanks in advance.

[Peter M]

An IRQ shared by PCI or AGP devices isn't a problem in itself.

As long as the drivers behave according to PCI specifications, all should be fine. Mostly PCI sound cards do not, and these then must be put in a slot that does not share its PCI INT lines with another device.

A board's PCI/AGP interrupt sharing scheme can be read from its PCI BIOS runtime functions - I have the tool to do it, but I don't have an M577 running DOS at hand currently. Just try and see what happens. Usually there's no problem even with shared IRQs.

Regards, Peter

[daryilha]

Peter, thanks for your info!

In fact, I don't know much about the AGP/PCI slot sharing problem. I think it is more than IRQ sharing. May be other signals have to compete for bus access.

As you mention sound board IRQ sharing, I can tell you that I just installed a Sound Blaster Live Value on PCI slot 3 (three, not one) and, according to PCI BIOS info at boot, it shares int 15 with the Viper 550 installed on the AGP slot. The system seems to work 100%. The Windows 98 System Information utility confirms the IRQ 15 sharing.
I would like to know how to block the IRQ sharing, so I can check if there are performance benefits.

Before I buy a video capture board that must be installed in PCI slot 1 (last available), I want to make sure things will work. One test I thought was install the sound board in PCI slot 1, but have been told that this won't work, so I'm a bit lost.

Thanks, Dary.

[mbaybut]

My problem is quite similar to this. I have a M726, I have a viper 550 in the AGP, Network card in PCI 1, Monster sound 300mx in PCI 2 and I bought a video capture card to put in PCI 3.
First I coundn't get the game port to enable, when I tried it would just send me into a reboot loop. PC100 web site did make mention to a problem with microsoft force feedback joystick,which I have, but the instructions are so bad I can't figure it out. And, when I install the video capture card my system refuses to boot up. Any help\advice would be appreciated.
Mike


Starting a new thread for your problem is the best way to get it resolved, and I see you have done so here http://sysopt.earthweb.com/forum/Forum5/HTML/003224.html http://sysopt.earthweb.com/forum/smile.gif -socalgal


[This message has been edited by socalgal (edited 05-28-2000).]