Biostar A55MH Manuale Proprietario

Placing the jumper on pin2-3, it allows user to restore the BIOS safe setting and 
the CMOS data. Please carefully follow the procedures to avoid damaging the 

motherboard. 

1

3

 

 

1

3

       

 
Pin 1-2 Close: 
Normal Operation (default). 
 

1

3

 

 
Pin 2-3 Close: 
Clear CMOS data. 

※

1. 

Remove AC power line. 

2. 

Set the jumper to “Pin 2-3 close”. 

3. 

Wait for five seconds. 

4. 

Set the jumper to “Pin 1-2 close”. 

5. 

Power on the AC. 

6. 

Load Optimal Defaults and save settings in CMOS. 

 

The motherboard has a Serial Port Connector for connecting RS-232 Port. 

1

9

2

1 0

1 Carrier 

detect 

2 Received 

data 

3 Transmitted 

data 

4 

Data terminal ready 

5 Signal 

ground 

6 Data 

set 

ready 

7 

Request to send 

8 

Clear to send 

9 Ring 

indicator 

10 NC