2.3 Selecting the CPU Frequency Ratio
3
Ratio
1
2
4
On
5x
On
On
Off
On
Off
On
5.5x
Off
6x
On
Off
Off
On
Off
Off
On
6.5x
Off
7x
On
On
On
Off
7.5x
Off
On
On
Off
On
Off
8x
On
Off
8.5x
Off
Off
On
Off
CPU Frequency Ratio Select - SW1
The table above shows the available frequency ratios and their
corresponding DIP switch setting. Make sure SW1 is set correctly
before applying power, otherwise you will not be able to power-on
the system.
Set pin 5 to On if you wish to use the CPUs default ratio. The
settings on pins 1 to 4 will have no effect. If you wish to manually
select the CPU s ratio, set pin 5 to Off then refer to the table for
the appropriate settings.
SW1 s default
setting.
Ratio
1
2
3
4
On
On
Off
Off
9x
Off
9.5x
Off
On
Off
10x
On
Off
Off
Off
Off
Off
10.5x
Off
Off
11x
On
On
On
On
On
On
11.5x
Off
On
On
On
Off
On
12x
On
12.5x
Off
Off
On
Hardware Installation
SW1: Pin 5
On: Auto - the system will run according
to the CPUs default ratio. Settings
on pins 1 to 4 will have no effect.
Off: Manual - use pins 1, 2, 3 and 4 to
select the desired ratio.
2
15
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