2
Hardware Installation
15
2.3 Selecting the CPU Frequency Ratio
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.
Ratio
5x
5.5x
6x
6.5x
7x
7.5x
8x
8.5x
1
On
Off
On
Off
On
Off
On
Off
Ratio
9x
9.5x
10x
10.5x
11x
11.5x
12x
12.5x
2
On
On
Off
Off
On
On
Off
Off
3
Off
Off
Off
Off
On
On
On
On
4
On
On
On
On
Off
Off
Off
Off
1
On
Off
On
Off
On
Off
On
Off
2
On
On
Off
Off
On
On
Off
Off
3
Off
Off
Off
Off
On
On
On
On
4
Off
Off
Off
Off
On
On
On
On
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 CPUs ratio, set pin 5 to Off then refer to the table for
the appropriate settings.
SW1s default
setting.