Solved

Changing NT 4.0 IRQ settings

Posted on 1997-06-29
4
484 Views
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.
0
Comment
Question by:jlvining
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
4 Comments
 

Author Comment

by:jlvining
ID: 1779416
Edited text of question
0
 
LVL 3

Accepted Solution

by:
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.
0
 

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.
0
 

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.
0

Featured Post

Announcing the Most Valuable Experts of 2016

MVEs are more concerned with the satisfaction of those they help than with the considerable points they can earn. They are the types of people you feel privileged to call colleagues. Join us in honoring this amazing group of Experts.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

In this article, I will show you HOW TO: Perform a Physical to Virtual (P2V) Conversion the easy way from a computer backup (image).
This article is a collection of issues that people face from time to time and possible solutions to those issues. I hope you enjoy reading it.
This video Micro Tutorial explains how to clone a hard drive using a commercial software product for Windows systems called Casper from Future Systems Solutions (FSS). Cloning makes an exact, complete copy of one hard disk drive (HDD) onto another d…
This is used to tweak the memory usage for your computer, it is used for servers more so than workstations but just be careful editing registry settings as it may cause irreversible results. I hold no responsibility for anything you do to the regist…

710 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question