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IRQ Dilemma

Posted on 2000-03-06
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Last Modified: 2010-04-26
I just had to configure a brand new Compaq Presario with a videocard and soundcard onboard. The models came with a pci modem. everyting worked fine

I went ahead and installed a NIC card. and it began something strange. I had IRQ problems, the Modem wanted the Nic'a IRQ. SO finally i removed the modem and the Nic placed itself somewhere and then i put back the modem and found an otherplace... everything was ok...

but as it seems, i just discovered something!

The Nic uses the same IRQ as the Videocard (IRQ3) but does not seem to use the same adressing block. and noting freezes and no conflict!

Could this cause problem...

I just discovered that the monitor's image wabbles sometimes. I am trying to rule that out, but could it be that the NIC having to cope with a lot of network traffic, affects the video dsiplay...

Im am trying to rule that out by using a second monitor to compare, but i  would like to know if it is remotly possible...

Awaiting answers...
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Question by:njacques
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by:sandman97289
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njacques, Windows (assuming you are using windows) does what is called IRQ sharing. What this does is allows various hardware devices to use the same IRQ addresses, windows manages (most of the time) to control these devices even though they share the same IRQ. Sometimes conflicts can arise though. For example I had a video capture card which wouldn't work because of IRQ conflicts with my sound card. So all in all to have two devices sharing the same IRQ is normally ok.

Now I doubt that the wobbling in your monitor is because of IRQ conflicts. Usually devices just refuse to work if there is a conflict. Have you checked the area around your monitor to check that there aren't any regulaters or transformers near by. Sometimes even keeping your computer case too near your monitor can cause wobbling. What happens is that devices which use inductors creat large amounts of magnet field. This magnetic field causes disturbances in your monitor, that is why you see it wobbling....

Hope this helped

Sandman
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by:njacques
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I will try to check that by using another monitor for 1-2 hours to see if it is the unit, or the environment...

Ill get back to you!
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Author Comment

by:njacques
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Ho! i forgot, the system is indeed using Widow95
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Expert Comment

by:sime788
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Just a thought. You say the screen is wobbling... putting 2 monitors close together often creates wobbling effects as they interfere with each other.

Sharing of IRQ's is common on PC systems as there are so few available and should work fine.

No a busy NIC will NOT affect the video card.

Hope this helps

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Expert Comment

by:kooltek
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try this...

go into device manager and remove the sound, modem and NIC. then reboot windows and see if it works.

cheers
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cycraymond earned 50 total points
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For your information,  Compaq Presario system required special driver.  I suggest that you use the driver from compaq.. . If I am not wrong, your modem is an internal modem come together with the system....

check it out:
    1. Is the device from compaq company
    2. Did you reinstall the system?
    3. What OS is it using....

You can goto the www.compaq.com site to check out the solution.... If the first 2 question above ANSWER is YES then I think you need a bios update from compaq for your machine... that you can download from the site mention above.

Good Luck for trying

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Expert Comment

by:sunsetyang
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 Some NIC will only work in its pre-defined work mode.That is to say:You can choose the right resource it has
been set.Or modify its work mode by
using the tools provided with it.To
modify the IRQ to the right one.Then
it will work.
  In Windows 95,some cards won't work if
it is sharing IRQ with others.
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by:sandman97289
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cycraymond please follow the protocol of this board and post comments instead of answers, this way the question can get the maximum exposure and other experts can also express their opinions. What you have stated above is not an answer it is a suggestion or opinion. I hope you will follow the protocol in the future...

Sandman
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