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. Call the support service for the software you are using to
help you with this problem.
Avoiding Interrupt Assignment Conflicts
Problems can arise if two devices attempt to use the same IRQ line. To avoid this type of conflict, check the documentation for the IRQ line's default for each installed
expansion card. Then consult Table3-1 to configure the card for one of the available IRQ lines.
Table 3-1. IRQ Line Assignment Defaults
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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 unless used by a secondary parallel port
IRQ6
Used by the diskette drive controller
IRQ7
Used by the primary parallel port
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-ROM controller
IRQ15
Embedded server management
NOTE: For the full name of an abbreviation or acronym used in this table, see the abbreviations and acronyms list at the end of this guide.