Chapter 6. Resolving System Resource Conflicts
This chapter describes the default system resources and how to
share an IRQ between two devices.
Note: This chapter is only for Windows 95.
Sharing an IRQ between ThinkPad Modem Devices
...... 83
Default IRQ Assignments ...................... 86
System Resources and IRQs .................... 86
In most cases, your computer automatically assigns the system
resources when you install a new device. For example, your
computer assigns such resources as the
interrupt request
(IRQ) level
and the
input/output (I/O)
ports when you install a PC Card modem.
Other devices might need such system resources as
direct memory
access
(DMA)
and
memory
. The IRQ for each system resource can
have a value of 0 to 15. That is, there are 16 values that can be
assigned for IRQs.
Sometimes Windows 95 does not allocate the resources correctly,
because the resource might already be allocated to another device.
This is called a system resource
conflict
, or
contention
. In this
case, you can free one IRQ by sharing an IRQ between two devices.
When doing this, you need to know about the system resources
available and their IRQs.
This chapter describes how to solve resource conflicts by sharing an
IRQ.
Sharing an IRQ between ThinkPad Modem Devices
The ThinkPad Modem function is supported by a digital signal
processor (DSP) called IBM Advanced Communications Processor.
The ThinkPad Modem usually uses two IRQs to handle the DSP
interrupt and the modem interrupt. However, by sharing an IRQ
between these two devices, you can free one IRQ so that you can
use it for another device.
Copyright IBM Corp. 1998 83
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