Chapter 3
3-18
1 (COM A)/Serial Port 2 (COM B). Selecting Auto allows BIOS to automatically
determine the correct base I/O port address. Settings: Disabled, 3F8/IRQ4,
2F8/IRQ3, 3E8/IRQ4, 2E8/IRQ3, Auto. If you have ISA add-on card, the
suggested configuration is as the following:
Note: To use the IR function, you need to enable the serial port 2.
UART 2 Mode
This setting allows you to specify the operation mode for serial port 2.
Setting options: IrDA, ASKIR, Normal.
HPSIR IrDA-compliant Serial Infrared Port
ASKIR Amplitude Shift Keyed Infrared Port
Standard RS-232C Serial Port
IR Function Duplex
This setting controls the operating mode of IR transmission/reception.
Setting options: Full, Half. Under Full Duplex mode, synchronous, bi-
directional transmission/reception is allowed. Under Half Duplex mode,
only asynchronous, bi-directional transmission/reception is allowed.
9999DISABLED X DISABLED X
99X X COM3 4 COM4 3
XX99 COM1 4 COM2 3
9 XX9 COM2 3 COM3 4
X 99X COM1 4 COM4 3
999X COM4 3 DISABLED X
99X 9 COM3 4 DISABLED X
9 X 99 COM2 3 DISABLED X
X 999COM1 4 DISABLED X
X X X X COM1 4 COM2 3
9 X X X COM2 3 COM3 4
X 9 X X COM1 4 COM3 4
XX9 X COM1 4 COM2 3
XXX9 COM1 4 COM2 3
If the ISA add-on card has Onboard Serial port to be set at
COM1
(I/O:3F8H)
COM2
(I/O:3F8H)
COM3
(I/O:3E8H)
COM4
(I/O:2E8H)
PORT1
PORT2
IRQ
ASSIGNED
IRQ
ASSIGNED
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