M-AUDIO DIO2448 - Manual (Page 17)

17
Troubleshooting
This section addresses potential problems that can occur in all operating
system environments, with emphasis on hardware troubleshooting. Within
the PC environment there are a limited number of hardware resources (I/O
addresses, IRQs, and DMA channels) available for use. Since audio cards
require many resources, most audio card installation problems arise from
unavailable or improperly set resources.
IMPORTANT: Most sound card installation problems result from
attempting to use system resources (IRQs, address locations)
already in use by other hardware (or software acting as “virtual”
hardware) in the system.
The DiO 2448 has been carefully designed to minimize the number of
resources consumed (it requires just one IRQ and does not require any DMA
channel resources). It is also capable of sharing an IRQ in some cases.
However, the possibility of resource conflicts still exists due to the nature of
the Windows environment. Many resource conflicts are automatically
recognized by Windows’ Plug-and-Play (PnP) system. When a resource
conflict is detected, it is displayed in the Windows Device Manager. The
Device Manager places a yellow exclamation point on top of the icon
associated with the problem device. For an example of how the Device
Manager should look when a DiO 2448 is successfully installed, see the
“Verifying Windows Driver Installation” section of this manual. If a yellow
exclamation point appears over your DiO 2448 icon, you may have a
resource conflict. There are several ways to approach this problem.
NOTE: When resolving conflicts between PnP and non-PnP
devices, it is recommended to re-adjust the resource settings of
the non-PnP device first. Typically, Windows is only aware of the
resource settings of the installed PnP devices and has no
information available to it for adjusting the PnP devices’
resources around those of the non-PnP devices. The exceptions
to this are when: (1) a non-PnP device has a true Windows 95/98
driver written for it, (2) the BIOS setup allows reserving an IRQ for
a legacy device as opposed to a PnP device, or (3) resource
requirements for the non-PnP device have been manually entered
into the Windows Device Manager. In these cases Windows is
aware of the non-PnP device’s resource requirements.
One of the quickest ways to change the resources assigned to a PCI card like
the DiO 2448 is to merely relocate the card to another PCI slot. With the
computer’s power off, remove the DiO 2448 from its current PCI slot, move
it to another available PCI slot, and turn your computer back on. More often
than not, this will change the IRQ assignment of the DiO 2448 when you re-
enter Windows. After returning to Windows, follow the steps outlined in the