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.