PCM-C418/Configuration
v1.0
www.winsystems.com
Page 15
6.3 Interrupt Map
Hardware interrupts (IRQs) are supported for both PC/104 (ISA) and PCIe devices. The
user must reserve IRQs in the BIOS CMOS configuration for use by legacy devices. The
PCIe/PnP BIOS uses unreserved IRQs when allocating resources during the boot
process. The table below lists IRQ resources as used by the PCM-C418.
Table 6:
IRQ resources
IRQ
Device
IRQ0
18.2 Hz heartbeat
IRQ1
Keyboard
IRQ2
Chained to slave controller (IRQ9)
IRQ3
COM2
IRQ4
COM1
IRQ5
USB/on-board Ethernet
IRQ6
USB
IRQ7
LPT
IRQ8
Real-time clock
IRQ9
COM3
IRQ10
Available
IRQ11
COM4
IRQ12
Mouse
IRQ13
Floating point processor
IRQ14
IDE
IRQ15
Available
These IRQ references are default settings that can be changed by the user in the CMOS Settings utility. Reference the
PCI Configurations section under Advanced Settings.
Some IRQs can be freed for other uses if the hardware features they are assigned to are not being used. To free an
interrupt, use the CMOS setup screens to disable any unused board features or their IRQ assignments.
