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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
Available
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
Embedded server management
NOTE: For the full name of an abbreviation or acronym used in this table, see "Abbreviations and Acronyms."