Chapter 1 
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: 
If
 the
 ISA add-on card has 
Onboard Serial port to be set at 
COMl 
COM2 
COM3 
COM4 
PORTl 
IRQ 
PORT2 
IRQ 
(I/0:3F8H) 
(I/0:3F8H) 
(1/0:ЗЕ8Н; 
(1/0:2Е8Н; 
PORTl 
ASSIGNED 
PORT2 
ASSIGNED 
У 
У 
V  • 
DISABLED 
X  DISABLED  X 
V  •/ 
X 
X 
COM3  4  COM4  3 
X  X 
•/  • 
COMl  4 
COM2  3 
• 
X  X 
• 
COM2 
3  COM3 
4 
X 
У  • 
X  COMl 
4  COM4  3 
•  у  • 
X  COM4 
3  DISABLED 
X 
•  V 
X 
• 
COM3  4  DISABLED 
X 
• 
X 
•  • 
COM2 
3  DISABLED 
X 
X 
у  • 
• 
COMl  4 
DISABLED  X 
X  X  X 
X  COMl 
4  COM2  3 
у 
X  X 
X  COM2 
3  COM3 
4 
X 
•/ 
X 
X  COMl  4 
COM3 
4 
X  X 
• 
X  COMl  4 
COM2 
3 
X  X 
X 
V 
COMl  4 
COM2 
3 
Note: To use the IR function, you need to enable the serial port 2. 
UART2Mode 
This setting allows you to specify the operation mode for serial port 2. 
Setting options: IrDA, AS KIR, Nonnal. 
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. 
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