Dell PowerVault 775N (Rackmount NAS Appliance) - Manual (Page 22)

If a specific key or set of keys is pressed at the wrong time, a program may give you unexpected results. See the
documentation that came with the application program to make sure that the values or characters you are entering are valid.
Ensure that the operating environment is set up to accommodate the programs you use. Remember that whenever you
change the parameters of the system's operating environment, you may affect the successful operation of the programs.
Sometimes, after modifying the operating environment, you may need to reinstall a program that no longer runs properly.
Program Conflicts
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 system can confirm whether these programs are the cause of the problem.
Device drivers, which are programs that use specialized subroutines, can cause problems with the system. For example, a
variation in the way the data is sent to the monitor 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 alternate method of running that particular program—by
creating a start-up file made especially for that program, for example. Contact the support service for the software you are
using to help you with this problem.
Avoiding Interrupt Assignment Conflicts
Most PCI devices can share an IRQ line with another device. However, no two devices can use the IRQ line simultaneously.
Problems can arise if a PCI device cannot share an IRQ line or if two devices attempt to use the same IRQ line
simultaneously. To avoid this type of conflict, see the documentation for each installed expansion card. See Table 3-1 to
configure the card for one of the available IRQ lines.
Table 3-1. IRQ Line Assignment Defaults
IRQ Line Used By/Available
IRQ0 Used by the system timer
IRQ1 Used by the keyboard controller
IRQ2 Used by interrupt controller 1 to enable IRQ8 through IRQ15
IRQ3 Used by serial port 2 (COM2 and COM4)
IRQ4 Used by serial port 1 (COM1 and COM3)
IRQ5 Available
IRQ6 Used by the diskette drive controller
IRQ7 Available
IRQ8 Used by the real-time clock
IRQ9 Used for power management functions
IRQ10 Available
IRQ11 Available
IRQ12 Used by the PS/2 mouse port unless the mouse is disabled in the System Setup program
IRQ13 Used by the math coprocessor
IRQ14 IDE CD drive controller
IRQ15 Available
NOTE: For the full name of an abbreviation or acronym used in this table, see " Abbreviations and Acronyms ."
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