Dell PowerEdge 2550 - Manual (Page 40)

Table 4-1. IRQ Line Assignment Defaults
Back to Contents Page
IRQ Line Used By/Available
IRQ0 Used by the system timer
IRQ1 Used by the keyboard to signal that the output buffer is full
IRQ2 Used by interrupt controller 2
IRQ3 Used by serial port 2 (COM2 and COM4) or a PCI device
IRQ4 Used by serial port 1 (COM1 and COM3) or a PCI device
IRQ5 Available unless used by a secondary parallel port
IRQ6 Used by the diskette drive controller
IRQ7 Used by the primary parallel port or a PCI device
IRQ8 Used by the RTC
IRQ9 Used by ACPI
IRQ10 Available
IRQ11 Available
IRQ12 Used by the PS/2 mouse port, unless the mouse option is disabled in System Setup program
IRQ13 Reserved for floating-point errors
IRQ14 Available
IRQ15 Used by ESM
NOTE: For the full name of an abbreviation or acronym used in this table, see " Abbreviations and Acronyms ."