EPX-C414/Configuration
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7.3 Interrupt Map
Hardware Interrupts (IRQs) are supported for both PC/104 (ISA), PCI and PCIe devices.
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 EPX-C414.
Table 7:
IRQ Resources
IRQ
Device
IRQ0
18.2 Hz heartbeat
IRQ1
Keyboard
IRQ2
Chained to slave controller (IRQ9)
IRQ3
COM2 *
IRQ4
COM1 *
IRQ5
COM3 *
IRQ6
COM4 *
IRQ7
LPT *
IRQ8
Real time clock
IRQ9
FREE **
IRQ10
Digital I/O
IRQ11
PCI interrupts
IRQ12
Mouse
IRQ13
Floating point processor
IRQ14
IDE
IRQ15
IDE
* These IRQ references are default settings that can be changed by the user in the CMOS Settings utility. Reference the
Super I/O Control section under Intel.
** IRQ9 is commonly used by ACPI when enabled and may be unavailable (depending on operating system) for other
uses.
*** IRQ15 is currently unavailable under the Windows operating systems.
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.
