Finding Software Solutions 4-3
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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 IRQ line’s default
for each installed expansion card. Then consult Table 4-1 to configure the card for one
of the available IRQ lines.
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IRQ0 Used by the system timer
IRQ1 Used by the keyboard to signal that the output buffer is full
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 RTC
IRQ9 Used for power management functions
IRQ10 Available
IRQ11 Available
IRQ12 Used by the PS/2 mouse port unless mouse is disabled in System
Setup program
IRQ13 Used by the math coprocessor
IRQ14 Available
IRQ15 Used by embedded server management functions
NOTE: For the full name of an abbreviation or acronym used in this table, see the abbreviations
and acronyms list that precedes the Index.
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