ADLINK Technology COM Express cExpress-BT2, User Manual

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System Resources
6.3. Interrupt Request (IRQ) Lines
6.3.1. PIC Mode
IRQ# Typical Intterupt Resource Connected to Pin Available
0 Counter 0 N/A No
1 Keyboard controller IRQ1 via SERIRQ / PIRQ No
2 Cascade interrupt from slave PIC N/A No
3 Serial Port 2 (COM2) IRQ3 via SERIRQ / PIRQ Note (1)
4 Serial Port 1 (COM1) IRQ4 via SERIRQ / PIRQ Note (1)
5 Parallel Port (LPT) IRQ5 via SERIRQ / PIRQ Note (1)
6 Generic IRQ6 via SERIRQ / PIRQ Note (1)
7 Generic IRQ7 via SERIRQ / PIRQ Note (1)
8 Real-time clock N/A No
9 Generic IRQ9 via SERIRQ / PIRQ Note (1)
10 Generic IRQ10 via SERIRQ / PIRQ Note (1)
11 Generic IRQ11 via SERIRQ / PIRQ Note (1)
12 PS/2 Mouse IRQ12 via SERIRQ / PIRQ Note (1)
13 Math Processor N/A No
14 Primary IDE controller IRQ14 via SERIRQ / PIRQ Note (1)
15 Secondary IDE controller IRQ15 via SERIRQ / PIRQ Note (1)
Note (1):
These IRQs can be used for PCI devices when onboard device is disabled.