AMD PCM-5862, Manual, Page: 31 / 99

Chapter 2 Installation 25
The IRQ and the address range for COM1, 2, 3, 4 are fixed.
However, if you wish to disable the port or change these
parameters later you can do this in the system BIOS setup. The
table below shows the settings for the PCM-5862's serial ports.
PCM-5862 serial port default settings
Port Address Range Interrupt
COM1 3F8~3FF IRQ4
COM2 2F8~2FF IRQ3
COM3 3E8~3EF IRQ10
COM4 2E8~2EF IRQ5
COM3/COM4 IRQ occupied/released (J8, J9)
The COM3 and COM4 are designed to use the IRQ5 and IRQ10
by default. If you are using the COM3 or COM4 with no need of
the interrupt, the IRQ of COM3 or COM4 can be released to other
peripherals by setting J8, J9.
COM3 IRQ occupied/released
*Occupied Released
J9
COM4 IRQ occupied/released
*Occupied Released
J8
* default setting