IRQ Conflict also Cant detect modem

By EfaustuS9
Jan 9, 2004
  1. I just reinstalled windows and my computer now can not detect my internal 3com PCI modem. In the device maneger it states there is an IRQ conflict which forces me to either disable the Printer port (LPT1 & COM) or my sound card as to free up resorces of one or the other. Also in the device maniger It is unable to detect a PCI communication device because of missing drivers, I think it is possible that this unidentified device my modem but I am unsure. I have not added or removed any hardware sence the reinstall, so I dont know how this IRQ conflict came about in any event does any one know how to resolve such an issue.
  2. RealBlackStuff

    RealBlackStuff TS Rookie Posts: 6,503

    Which Windows version?
    By reinstalling you may unknowingly have changed from ACPI to Standard PC or vice-versa. Check in Control Panel/System/Device Manager under Computer what it says there.
    Also, if you can copy it out, let us know which IRQs are used in your PC (In Device Manager, click View/Resources by type/Interrupt request
  3. EfaustuS9

    EfaustuS9 TS Rookie Topic Starter

    I have installed Windows 98SE in place of Windows 98.

    The IRQs in use currently are as follows:

    00 system timer
    01 Standard keyboard
    02 program interrupt controller
    03 COM2
    04 COM1
    05 Adaptec AIC-7850 PCI scsi controller
    06 Floppy Disk Controller
    07 Creative AWE64 16-bit audio
    08 CMOS/Real time clock
    09 Nividia Riva TNT2 PRo
    09 IRQ holder steering
    10 IRQ Holder Steering
    11 Internal USB controller
    12 ps2/2 mouse controller
    13 number data proccessor
    14 IDE controller bus master
    14 primary IDE controller
    15 intel Bus master controller
    15 secondary IDE conroller

    I have some screen shots of some of the other aspects of the device maneger you ask me to investigate, hopefully these help.

    (Note: It seems as though I can only post 1 at a time, and the service wont accept zip files, but I have the 3 others)

    Attached Files:

  4. RealBlackStuff

    RealBlackStuff TS Rookie Posts: 6,503

    Unless you play games under DOS, you could take the Soundblaster-parameters out of your Autoexec.bat and your Config.sys files (just use Notepad to edit them both) and put the word REM and a space in front of each of those lines.
    That should free up IRQ 7. Your internal modem will most likely want to install on COM3 (which uses the same IRQ as COM1), so you could go into your BIOS and disable COM2 there.

    Do you have any exclamation or question marks in your Device Manager?
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