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IRQ conflicts

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by da1857

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System had to be re-configured back to factory settings due to virus problems. I'm using windows 98 ver 4.10.2222. When I restored to factory settings, I'm now faced with IRQ conflicts where there may be three items assigned to one IRQ ie IRQ 9 ACPI IRQ Holder for PCI IRQ Steering, Adaptec AIC-7850 PCI SCSI Controller, SCI IRQ used by ACPI bus. The ACPI IRQ gikder for PCI IRQ Steering is also flagged in IRQ 05, 09, 10, 11, 14, and 15. Any help would be greatly appreciated. The only new piece of hardware added to system since purchased was the SCSI card which did conflict the first time.

10 replies

by dave.osborne

This might have already been tried, but did you remove the SCSI card, restore the PC to factory settings, and then reinstall the SCSI card?

by cg it

Certain devices share IRQ's and unless the system reports a conflict [re: device manager, particular device properties, the device states a conflict].

SCSI, though a much faster I/O than IDE, seems to always have a problem with interrupt conflicts when faced with sharing system resources with non SCSI componets, no matter what O/S and version.

As answer # 1 suggested, take out the SCSI card or disable it, then run the system and see if the interrupt conflict goes away. If it does, you may have to manual specify IRQ settings for it. Also, if you have your motherboard BIOS set to assign PnP resources [IRQ'a] disable that, enable O/S PnP support and let the O/S assign resources. [or reverse this and instead of O/S assigned resources have the BIOS assgin resources depending upon your initial setup that has the IRQ conflict].

by cg it

If you've added PCI SCSI card for HDD controller to obtain the faster I/O than the onboard IDE HHD controller, I suggest that you go to a motherboard that is SCSI and not IDE. Forever has there been a problem with IDE and SCSI compatibility when adding a SCSI controller card into an IDE controller based system. [even back in the days of DOS].

by derekhyps

irq steering is a way to let multiple devices use those so few IRqs. so whats the real problem? you say the system has been reconfiged to factory settings. do you mean the OS or the motherboard. If your OS is now in conflict with bios. I would go into bios setup and reset the bios config setting so the motherboard can once again reanalyze what devices are really out there. that could be an issue if the bios setting is set to "plug and play OS = NO" changing it to yes will allow win98 to assign IRQ's" Your scsi irq should be reserved in the bios.and device manager should be manually configured after running the add new hardware setup since legacy devices wont be found.

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