in my system information it list the irq's from 0 to 15 and i notice that not all the numbers are used, perhaps because i have disabled some things i don't need like serial ports, but even so,
several numbers are being used by more than one device. so should i change them so all numbers are used and as few as possible are being shared, and is this best done in the bios?
Don't worry about it. Unlike ISA devises, a single IRQ number can be shared among multiple PCI devices.
Idealy, you don't want all your ICQs to be used if you want to add more devices later.
If you're using Win2k then most add-on devices will be on 1 IRQ. There is a way to prevent this, but I don't remember how. It has to do with the APM setting in your bios, I believe.
If its Win98 or 98SE then the AGP vid card needs to be on an IRQ of its own. Unless you have a video capture card, then these can share the same IRQ. The soundcard can share an IRQ with an NIC, modem, or both.
Lets see if I remember this correctly.
For a Raid board w/ 6 PCI slots.
AGP and PCI1 share an IRQ.
PCI2 and PCI3 share an IRQ.
PCI4 and PCI6 share an IRQ.
PCI5 and Raid controller share and IRQ.
Non-Raid w/ 6 PCI slots.
Only difference I believe is that PCI5 doesn't share unless you have a soundcard or NIC in this slot.
5 PCI slot board.
AGP and PCI1 share.
PCI2 and PCI4 share.
PCI3 and PCI5 share.
and if there is an ISA slot then it shares the same IRQ as PCI5.
I could be a little off on this though.
thanks folks, i'm not sure yet whether to change anything. i'm using windows ME and have an agp card and a pci sound card. the other 4 pci slots are not used and not likely to be. seems a shame that 3 of the irq's are not in use.
Well i would say change nothing, unless there is a problem.
But I would think about moving any devices on IRQ2 and 9
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