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Dell Inspiron 7000 Reference and Troubleshooting Guide
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Some programs may leave portions of their setup information behind, even though
you have exited from them. As a result, other programs cannot run. Rebooting the
computer can confirm whether or not these programs are the cause of the problem.
Other programs use specialized subroutines called
drivers that can cause problems in
the computer. For example, a variation in the way the data is sent to an external mon-
itor may require a special screen driver program that
expects a certain kind of video
mode or monitor. In such cases, you may have to develop an alternative method of
running that particular program—for example, the creation of a boot file made espe-
cially for that program. For help with this situation, call the support service offered by
the manufacturer of the software you are using.
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Problems can arise if two devices attempt to use the same interrupt request (IRQ)
line. To avoid this type of conflict, check the documentation for the default IRQ line
setting for each installed device. Then consult Table 3-4 to configure the device for
one of the available IRQ lines.
NOTE: Installed devices cannot share the same COM port address. The default
address of the computer’s serial port is COM1.
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IRQ0
Generated by the system timer
IRQ1
Generated by the keyboard controller to signal that the key-
board output buffer is full
IRQ2
Cascade to second interrupt controller
IRQ3
Reserved
IRQ4
Used by the communications port (COM1)
IRQ5
Used by the audio controller
IRQ6
Generated by the diskette drive controller to indicate that the
diskette drive requires the attention of the microprocessor
IRQ7
Used by the parallel port
IRQ8
Generated by the system RTC
IRQ9
Free
IRQ10
Generated by the USB
IRQ11
Generated by the cardbus controller
NOTE: For the full name of an abbreviation or acronym used in this table, see the Glossary
in the System User’s Guide.
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