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Troubleshooting Guidelines 2
82350B Installation and Configuration Guide 41
conflicts with other drivers in the system. PCI
allows sharing of IRQs, but this also means the
drivers for cards which share an IRQ must
handle interrupt chaining properly. Both
Windows NT and Windows 98 allow multiple
drivers to install interrupt service routines
(ISRs) for a single IRQ. The operating system
(OS) keeps a list of all the ISRs installed for
each IRQ.
When the IRQ is asserted, the OS calls each ISR
in turn until one of them returns TRUE (meaning
that it handled the interrupt). The ISR’s
responsibility is to correctly return TRUE if its
device was interrupting or FALSE if not. Drivers
that return TRUE, even though they did not
service the interrupt, will cause problems. Try
the following steps to perform driver
workarounds:
• Upgrade the drivers for devices sharing an IRQ
with Agilent, including, but not limited to,
your video drivers, your LAN drivers, Agilent
IDE and/or SCSI drivers, and your sound
drivers.
• For Windows 98SE, change your BIOS
Installed OS setting.
Try all the different values and use the one
that works. Make sure all devices sharing an
IRQ with your card have drivers installed.
• Right-click My Computer and select
Properties, then Device Manager. Highlight
Computer and click Properties. Find the
82350 card and check that all other cards on
the same IRQ have a valid driver, not the big
yellow question mark.
4 Reconfigure Your PC. Configure your PC so as
to not share IRQ lines. Many PCI cards have
bugs when sharing IRQ lines. You may or may
not be able to do this on all PCs. Many PCs can