6BX
/VIA/ZX81
Jumper Setting
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CMOS Clear JP7
Normal
2-3 Close (Default)
Clear CMOS
3-4 Close
External Battery
1-2 , 3-4 Close
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CPU External Frequency JP6
On = Close Off = Open
ModelRatio
JP6
1-2
3-4
5-6
7-8
2.0 x
On
On
On
On
2.5 x
Off
On
On
On
3.0 x
On
Off
On
On
3.5 x
Off
Off
On
On
4.0 x
On
On
Off
On
4.5 x
Off
On
Off
On
5.0 x
On
Off
Off
On
5.5 x
Off
Off
Off
On
6.0 x
On
On
On
Off
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