4.3. Getting an A+
This chapter introduces you to the concept of system resources. Although you will not find many questions on the exam covering system resources, you need to understand resources and know that today's systems resources are assigned to the hardware automatically by the system. The following is a list of key points to remember about system resources:
An I/O address is the pathway used by a device to send and receive information to and from the processor.
An IRQ is a signal that a device can send to interrupt the processor from its current task.
A DMA channel is a device's direct pathway to memory so that it can read and write information to memory without bothering the processor.
Changing resources on legacy devices usually involves changing jumper settings or running the diagnostic program for the device.
Changing resources on Plug and Play devices involves going to Device Manager in Plug and Play operating systems and changing the resource for the device.
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