Table of Contents
Advertisement
2. CPU Voltage Selection: JP3 (Yellow color selector)
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 JP3 CPU voltage selection (O: open, S: short)
CPU TYPE
Intel Pentium single Voltage P54VRE
AMD single Voltage K5
Cyrix/IBM single Voltage 6X86
IDT-C6 150/180/200
Intel Pentium single Voltage P54STD
AMD K6/MMX Dual Voltage K6-PR233
AMD K6/MMX Dual Voltage K6-PR166/200
Cyrix/IBM Dual Voltage (MX 166/200)
Cyrix/IBM Dual Voltage 6X86L 166 + /200 +
Intel/MMX Dual Voltage (P55C,166/200/233)
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: JP4 (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
ON
OFF
ON
OFF
DIP SWITCH
2
ON
ON
OFF
ON
ON
OFF
ON
ON
OFF
OFF
OFF
ON
Voltage 1-2
3-4
3.52V
S
S
3.45V
O
S
3.2V
O
O
2.9V
S
O
2.8V
O
O
External clock
frequency
3
50MHz
55MHz
60MHz
66.6MHz
75MHz
83.3MHz
6
5-6
7-8
Default
S
S
S
S
S
S
O
S
*
O
S
Advertisement
Table of Contents
