5. SPECIFICATION
5-10
IRQ assignment when the APIC is disabled
Interrupt pin
Description
IRQ0 Timer
IRQ1 Not
used
IRQ2 Cascade
IRQ3
Serial port 2 (COM2): B
IRQ4
Serial port 1 (COM1): A
IRQ5 Not
used
IRQ6 Not
used
IRQ7 Not
used
IRQ8 Real-time
clock
IRQ9
SATA, SCI, All PCI devices
IRQ10 Not
used
IRQ11 Not
used
IRQ12 Not
used
IRQ13 Coprocessor
IRQ14 Not
used
IRQ15 Not
used
5.5 Serial Port Settings
The factory default settings for the serial ports are as follows. Do not change those settings.
If you do, the equipment may not work properly.
Name recognized
by the BIOS
I/O address (*)
IRQ assignment (*)
Name recognized
by the OS
Note
Serial port A
3F8h
IRQ 4
COM1
Standard feature
Serial port B
2F8h
IRQ 3
COM2
Option
(*) Automatically assigned by the BIOS.
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