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This jumper is used for adjusting CPU working voltage, for this main board
design it can auto detect the single voltage CPU or dual voltage CPU.
The table of JP15 CPU voltage selection (O: open, S: short)
CPU TYPE
Intel Pentium processor Voltage P54VRE
AMD single Voltage K5
Cyrix/IBM single Voltage 6X86
IDT-C6 150/180/200
Intel Pentium processor Voltage P54STD
AMD K6-PR233 Dual Voltage K6-PR233
AMD K6-PR166 Dual Voltage K6-PR166/200
Cyrix/IBM 6X86MX -166, -200 Dual Voltage
(MX 166/200)
Cyrix/IBM 6X86L 166 + Dual Voltage 6X86L 166 +
Intel Pentium processor with MMX technology
Dual Voltage (166/200/233)
AMD K6-PR233 Dual Voltage K6-PR233
If your CPU Type is not including in above table, please refer to the CPU voltage
selection on below to choose the correct working voltage for your CPU.
3. CPU Type selection: SW1 (6-Pins DIP Switch)
This mainboard design use 6-pins DIP switch to select the CPU, external
clock frequency & Bus frequency ratio, and the external clock frequency
multiplied by Bus frequency ratio is the CPU frequency as the tables below:
Table for CPU external clock frequency
DIP SWITCH
DIP SWITCH
1
ON
ON
OFF
ON
Table for Bus frequency Clock Ratio
DIP SWITCH DIP SWITCH DIP SWITCH
DIP SWITCH
2
ON
ON
ON
OFF
ON
ON
OFF
ON
Voltage
1-2
3.52V
S
3.45V
O
3.2V
O
2.9V
S
2.8V
O
2.2V
O
External clock
3
frequency
50MHz
55MHz
60MHz
66.6MHz
Clock Ratio
6
3-4
5-6
7-8
Default
S
S
S
S
S
S
O
S
S
O
O
S
O
O
S
S
O
O
*
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