Technical data

Device Mapping
B-5
Computer Interrupt Levels
Interrupt Number Interrupt Source
IRQ0 Timer tick
IRQ1 Keyboard controller
IRQ2 Cascade interrupt
IRQ3 COM2, COM4 (if enabled)
IRQ4 COM1, COM3 (if enabled)
IRQ5 Audio (if enabled)
IRQ6 Diskette (floppy disk) drive (if enabled)
IRQ7 LPT1, LPT3 (if enabled)
IRQ8 Real Time Clock (RTC)
IRQ9 Video
IRQ10 Network (if enabled)
IRQ11 Available
IRQ12 Mouse interrupt (if enabled)
IRQ13 Math co-processor
IRQ14 IDE primary (if enabled)
IRQ15 IDE secondary (if enabled)