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that does not already have a device assigned to it is avail-
able for use.
All Windows operating systems:
When PCI bus IRQ steering
is enabled, Windows will direct PCI bus IRQs to devices
such as your modem. Sometimes, however, the IRQ that
Windows assigns to your modem will conflict with the com-
puter’s BIOS.
To disable IRQ steering
: Select
Control Panel >System > Device
Manager >System Devices.
Right-click
PCI Bus,
then click
Properties
to open the
Properties
page
.
Click the
Resource
tab, then
IRQ Steer-
ing.
Disable
IRQ Steering
. If the PCI modem you have just in-
stalled is listed, highlight it and click
Remove
, and then reboot
your system. If this doesn’t disable the “IRQ Holder for PCI
Steering,” please contact Microsoft Technical Support.
IRQ assignment:
Only computers with an updated BIOS will be
able to assign an available IRQ to the PCI slot on the mother-
board. Check your computer’s documentation, or the mother-
board itself, for the number of the PCI slot.
If you have a VIA chip-based motherboard:
Computers with
this chipset frequently have problems installing PCI modems
unless the
VIA IRQ Routing Miniport Driver
is installed. If your com-
puter’s
User Manual
doesn’t specify that your motherboard is
VIA chip-based, you can examine the motherboard to check. If
you do have a VIA chip-based motherboard, refer to
http://www.via.com.tw/en/support/tech_faq.jsp
for driver in-
formation and help.
Problem
Your modem seems to install but Windows cannot find it later.
Solution
If your computer has a built-in modem on the motherboard, Win-
dows may reinstall it the next time you start up. Consult your
computer’s documentation or call your computer’s manufacturer
to get instructions on how to disable the built-in modem.
Problem
The software cannot find the modem and the modem does not
respond to AT commands. (The following comment applies to
many other problems as well.)
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