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Subject: "IRQ Question" Previous topic | Next topic
_Chewy_Thu May-22-03 01:49 AM
Member since Dec 07th 2002
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"IRQ Question"


  

          

I have a problem with Windows 2000 automatically assigning IRQs to some of my devices. In the screenshot provided, you'll see several devices all assigned to IRQ 9. I would like to change the assignment but Windows 2000 will not let me. I thus thought about going into the system BIOS menu and changing the settings. Dell 4100 system. It has been a long time since i've looked but as I recall there was an option in my BIOS where it said something like PnP OS? Yes/No.

If i set that option to No, then will I be able to manually re-assign them or not? Will it totally screw up my system? If IRQ 10 and 11 are supposed to be available, then why aren't they being used?????

I have been having a long-time modem issue with my setup and am just absolutely at my wits end trying to figure out what is wrong. Right now i suspect that is because it is on IRQ 9 (in the screenshot provided) and I know that internal modems are typically assigned to IRQ 3. Regardless, it's supposed to be IRQ 3 or 4 as dictated by the order of assignments on COM ports.

I have a winmodem (Dell provided) that connects ok upon boot up but if i get knocked off or disconnect, then it refused to re-connect. Always gives me some excuse about line being busy or password is not valid, etc. I have even tried new access numbers provided by my ISP (MSN). So I have to warm boot the system in order for the modem to connect again on the first try. My question is the paragraph in italics. And yes I have updated my drivers for the modem.

I would appreciate any suggestions.

Attachment #1, (jpg file)

  

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ShellyWed Mar-19-03 08:23 AM
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#1. "RE: IRQ Question"
In response to _Chewy_ (Reply # 0)


  

          

This is normal in W2K and XP. It is a result of the ACPI specification. http://www.acpi.info/index.html

ACPI is, among other things, a solution for the limited number of IRQ addresses available in the original PC design. It works by switching a single IRQ among a number of devices as needed transparently. I would not try to outsmart ACPI, it is a valuable fix that allows PC's to meet modern computing needs. It can be turned off in the BIOS, if there is a problem with your system, but if it is working you should leave it alone.

Shelly

  

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_Chewy_Wed Mar-19-03 08:43 AM
Member since Dec 07th 2002
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#2. "RE: IRQ Question"
In response to Shelly (Reply # 1)


  

          

Thank you Shelly. Quick question... this is as i have memorized them: IRQ 3 for COM 2 & 4; IRQ 4 for COM 1 & 3. If an internal modem is supposed to be on COM 3 or 4... then how is it possible for my modem to be assigned IRQ 9 and still connect? And do you think that perhaps my modem issue (as described in my original post) has in anyway related to this IRQ assingment?

  

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