INSTALLATIONS
MB720 User’s Manual 9
Configuring the CPU Frequency (for A1 version only)
The MB720 A1 version supports FSB manual adjustment, but this
feature will be removed in the B1 version.
FSB 1 2 3
4
100MHz ON ON OF
F
OF
F
133MHz OF
F
ON OF
F
OF
F
166MHz OF
F
OF
F
OF
F
OF
F
200MHz ON OF
F
OF
F
OF
F
JBAT1: Clear CMOS Contents
Use JBAT1 to clear the CMOS contents. Note: Disconnect the
ATX-power connector from the board before clearing CMOS.
JBAT1 Setting Function
Pin 1-2
Short/Closed
Normal
Pin 2-3
Short/Closed
Clear CMOS
JP1: COM3 RS232 +5V / +12V Power Setting
Pin #
Signal Name JP1 Signal Name
Pin #
1 RI +12V 2
3 RI (Default) RI (Default) 4
5 RI
+5V 6
COM3 Settings: Pin 1-2 short = +12V, Pin 5-6 short = +5V, Pin 3-4
Standard COM Port
JP2: COM4 RS232 +5V / +12V Power Setting
Pin #
Signal Name JP2 Signal Name
Pin #
1 RI +12V 2
3 RI (Default) RI (Default) 4
5 RI
+5V 6
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