230 If Something Goes Wrong
Resolving a hardware conflict
5.375 x 8.375 ver 2.4.0
the computer’s Central Processing Unit (CPU). It also needs
a direct channel to the computer’s memory to store
information as it works. These channels of communication
are commonly referred to as system resources.
Interrupt Request Channel
The channel to the CPU is called an Interrupt Request (IRQ)
because it interrupts what the processor is doing and requests
some of the processor’s time. If two or more devices use the
same IRQ, the processor does not know which device is
asking for attention. This causes a hardware conflict.
Direct Memory Access
Similarly, the data required by the device is stored in a
specific place or address in memory called the Direct
Memory Access (DMA). The DMA provides a dedicated
channel for adapter cards to bypass the microprocessor and
access memory directly. If two or more devices use the same
DMA, the data required by one device overwrites the data
required by the other, causing a hardware conflict.
Resolving conflicts
There are three things you can do to resolve hardware
conflicts:
❖Disable the device.
For an older device, remove it from the computer.
❖Disable another system component and use its resources
for the new device, see “Fixing a problem with Device
Manager” on page 231.
❖Reconfigure the device so that its requirements do not
conflict. Refer to the device’s documentation for
instructions about changing settings on the device.