JUMPERS
The default settings are highlighted in the tables that follow.
CPU Frequency Setting (JP3)
Frequency
1-3
3-4
3-5
4-6
50 MHz
OFF
OFF
ON
ON
66 MHz/100 MHz*
ON
ON
OFF
OFF
75 MHz
OFF
ON
ON
OFF
83.3 MHz
ON
OFF
OFF
ON
*Intel Celeron CPU will auto-detect 66 MHz or 100 MHz.
Refer to figure 2 for the location of JP3.
CPU Multiplier Setting (JP8)
Ration
1-2
3-4
5-6
7-8
3.0 x
ON
OFF
ON
ON
3.5 x
ON
OFF
OFF
ON
4.0 x
OFF
ON
ON
ON
4.5 x
OFF
ON
OFF
ON
5.0 x
OFF
OFF
ON
ON
5.5 x
OFF
OFF
OFF
ON
6.0 x
ON
ON
ON
OFF
6.5 x
ON
ON
OFF
OFF
Refer to figure 2 for the location of JP8.
Watchdog Timer Type Setting (JP5)
The Watchdog Timer is enabled by reading port 443H. It should be triggered before
the timeout period ends; otherwise, it will assume the program operation is abnormal
and will issue a reset signal to reboot or activate NMI to CPU. The Watchdog Timer is
disabled by reading port 043H.
Pin Number
Description
1-2
NMI
2-3
RESET
Refer to figure 2 for the location of JP5.
Board Configuration
13
