080505
OPERATIONS MANUAL PPM-GX500
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Hardware Interrupts (IRQs) are supported for both PC/104 (ISA) and PC/104-
Plus
(PCI)
devices. The user must reserve IRQs in the BIOS CMOS configuration for use by legacy
devices. The PCI/PnP BIOS will use unreserved IRQs when allocating resources during the
boot process. The table below lists IRQ resources as used by the PPM-GX500.
IRQ0 18.2 Hz heartbeat
IRQ1 Keyboard
IRQ2 Chained to Slave controller (IRQ 9)
IRQ3
COM2 *
IRQ4 COM1 *
IRQ5 COM3 *
IRQ6 Floppy Disk
IRQ7 LPT *
IRQ8 Real Time Clock
IRQ9 COM4 *, **
IRQ10 FREE
IRQ11 PCI Interrupts
IRQ12 Mouse
IRQ13 Floating point processor
IRQ14 IDE
IRQ15 FREE
* 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.
** IRQ15 is currently unavailable under the Windows XPe or CE
operating systems. IRQ9 is used by ACPI in XP and is unavailable for other uses.
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.
Interrupt Map
