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Changing NT 4.0 IRQ settings

Posted on 1997-06-29
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Last Modified: 2013-12-28
I am using a Pentium Pro 200 that apparently is using IRQ 11 even though how it is being used is not indicated in the NT Diagnostics Resources.  I have an Adaptec 1520 SCSI adapter for a Seagate SCSI tape drive that has IRQ settings 9-12 on the adapter.  I tried IRQ 9 and 11 on the adapter and both times Event Viewer indicated an IRQ conflict with IRQ11 on SCSI device 2.

I have gone to the registery under HKey_Local_Machine changed the IRQ setting for device 2 to IRQ 9 and rebooted.  Each time it automatically changes back to IRQ 11 and Event Viewer indicates an IRQ conflict with IRQ 11.

My question:  What is the proper way to change IRQ settings in NT 4.0.  I think IRQ 9 would resolve the conflict I am experiencing.
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Question by:jlvining
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Author Comment

by:jlvining
ID: 1779416
Edited text of question
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brauner071697 earned 50 total points
ID: 1779417
Your Problem is in the BIOS of your PC
I think you have a PCI-BIOS, with that you must change the IRQ assignments of your configuration. Disable the IRQ 11 for your PCI SLots (the adaptec ISA card need it under NT).
In NT you can't change the IRQ how you make it in WIN95 in the Hardware Manager. Here in the most case you control it over the BIOS or over the Software from the Harware (ISA cards).
Make sure that the right driver for your adaptec is loaded.
What version of OS you have, if not so try SP3.
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Author Comment

by:jlvining
ID: 1779418
Seems to have technical knowledge but his communications skills are poor.  I think I know what he's trying to tell me, but I'm not really sure.

I tried his suggestion, went to the BIOS, changed the settings and still have a conflict in Event Viewer of NT.
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Expert Comment

by:mhorton
ID: 1779419
Just a comment on IRQs.
IRQ 2 and IRQ 9 are used differently by the hardware system than one might think.
IRQs 9 through 15 are cascaded through IRQ 2.  (By cascaded, I mean that IRQs 9 through 15 are attached to the IRQ 2 pin on the IRQ controller chip; an IRQ 10 appears to be from IRQ 2 to the system.)  
Systems using IRQ 2 for a device remaps the IRQ to IRQ 9.  

Whether this helps, I don't know but it may explain why the IRQs do not appear to work properly.
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