Special PCI Communication card requires PCI Slot 2 & IRQ 10

October 28, 2012 at 21:50:57
Specs: Windows XP Professional 32 Bit
How do I assign a specific IRQ number to a specific PCI slot on Windows XP Pro 32 Bit system? From what I understand ACPI needs to be disabled, preferably by way of F5 during fresh XP Install.. After this is done, do I still require a motherboard that has a setting to manually set IRQ number in it's BIOS? If so does anyone know a Socket 1155 Motherboard with this feature?

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October 28, 2012 at 23:51:38
PCI slots are more picky about IRQ's than the older ISA. Usually the best thing to try with a PCI IRQ problem is to move the card to a different slot. Modems (if that's what your PCI communication card is) seem to do best in the highest numbered PCI slot. That will be the slot at the bottom of the motherboard--assuming that motherboard is setting upright in a typical mini tower.

I'm not aware of any particular motherboard bios' that allow you to specify IRQs to specific slots. Many--especially older ones--alow you to reserve an IRQ for legacy/ISA devices. In your case you would want to make sure that IRQ10 was not reserved for that purpose.

If the card installation instructions say to use PCI2 then I'd go ahead and install it there and if XP doesn't assign it IRQ10, go into device manager and see if you can change its IRQ.

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October 29, 2012 at 06:32:13
Many BIOS settings will allow manually assigning an IRQ to a PCI slot within limits.

Without knowing the model of the computer or motherboard it is impossible to answer your question.

OEM computers (pre-assembled by name brand) have very limited BIOS choices so the suggestion made by DAVEINCAPS may be your only choice.

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October 29, 2012 at 08:45:13
I don't have a motherboard to really test this out on.. I know that OEM PC's have very limited BIOS which is why I am preparing to buy a motherboard off of newegg to facilitate this need, but I need to find out an exact model of motherboard that does in fact allow changing IRQ in the BIOS before making a purchase.. I would like it to be as modern a motherboard as possible. The Comm card I will be using, which is made to connect to a piece of medical equipment absolutely requires that it is plugged into PCI slot 2 and has an IRQ value of 10 assigned to it.. How can I go about manually changing IRQ for a specific PCI slot under Device Manger in XP Pro?

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October 29, 2012 at 13:48:29
Why do you have to have a socket 1155 board?

Many of them don't even have PCI slots anymore.

You would be better off using an older system that was designed to run WinXP.

As DAVEINCAPS stated you may be able to find a board with the ability to reserve that IRQ. This was common years ago.

Post details on the communication card in question.

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October 29, 2012 at 15:26:14
I am awaiting further detail on the PCI card, I do not have one here. All I know is that the card will only communicate properly with it's accompanying digital medical imaging system if it is operating in PCI slot 2 with IRQ 10. Also, apparently between the comm card and the software needed to operate the device no processors with logical cores, i.e. Hyperthreaded will work.. I've seen it working properly on an HP Compaq 6005 Pro Microtower with Windows XP Pro 32 Bit with a Pentium D processor.. I only hoped there was a more modern board available, like socket 1155 with IRQ settings available as to utilize corei3 or i5 processors.. What is likely the latest generation of motherboard that will allow IRQ programming?

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October 29, 2012 at 15:33:37
YOur explaination pretty much precludes using any 1155 socket board, or any current version board from AMD or Intel. Virtually all modern designs include multicore processors. See the link below.


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October 29, 2012 at 16:00:41
Pentium D works. Pentium 4 with HT technology doesn't work.. I thought only the i7 core processors had hyperthreading.. Assumed that and i3 or i5 could work.. Still think a core 2 dua could work.. Multi core is OK, multi Logical core is not ok.. So to start, what is a good Pentium D motherboard available at newegg.com supports Manual IRQ settings in BIOS?

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