Specifications
| Table |
| System Interrupts |
|
|
Hardware | System |
| IRQ | Function |
|
|
IRQ0 | System timer |
|
|
IRQ1 | Keyboard controller |
|
|
IRQ2 | Cascaded |
|
|
IRQ3 | Infrared |
|
|
IRQ4 | COM1 |
|
|
IRQ5 | Available for Parallel port |
|
|
IRQ6 | Diskette drive |
|
|
IRQ7 | Available for Parallel port |
|
|
IRQ8 | Real time clock (RTC) |
|
|
IRQ9 | Microsoft |
|
|
IRQ12 | Internal point stick or external mouse |
|
|
IRQ13 | Numeric Data Processor |
|
|
IRQ14 | Primary IDE Channel |
|
|
IRQ15 | Secondary IDE Channel |
|
|
IRQ 16 | Graphics Controller and USB Host Controller |
|
|
IRQ 17 | Audio and Modem |
|
|
IRQ 18 | USB Host Controller, Cardbus Controller, and FlashMedia |
| Controller |
|
|
IRQ 19 | USB Host Controller |
|
|
IRQ 20 | LAN Controller |
|
|
IRQ 21 | Mini PCI Wireless Adapter |
|
|
IRQ 23 | USB 2.0 Host Controller and 1394 Host Controller |
✎Either the infrared or the serial port may assert IRQ3 or IRQ4.
Maintenance and Service Guide |