AOpen AP57-TBL User Manual
Appendix A
Jumper Table Summary
Setting the CPU Voltage
JP7
1-2
3-4
5-6
7-8
9-10
11-12
JP9
Close
Open
CPU Type Vcore Vio Vcpuio JP7 JP8 JP9 JP10 JP11
INTEL P54C 3.45V 3.45V Vcore 1-2 1-2 Closed Open Closed
INTEL PP/MT 2.8V 3.45V Vio 7-8 1-2 Open Closed Open
AMD K5
(Single voltage)
AMD K6 2.9V 3.45V Vio 5-6 1-2 Open Closed Open
Cyrix 6x86 3.52V 3.45V Vcore 3-4 1-2 Closed Open Closed
Cyrix 6x86L 2.8V 3.45V Vio 7-8 1-2 Open Closed Open
CPU Core Voltage (Vcore)
3.45V (default for P54C)
3.52V (Cyrix or AMD)
2.9V (AMD K6)
2.8V (PP/MT P55C)
2.7V
2.5V
JP10
Open
Close
3.52V 3.45V Vcore 3-4 1-2 Closed Open Closed
JP11
Close
Open
CPU Type (Vcpuio)
Single Voltage CPU, Vcpuio = Vcore, (default).
Dual Voltage CPU, Vcpuio = Vio, (PP/MT P55C).
JP8
1-2
3-4
I/O Voltage (Vio)
3.45V (default)
3.52V
A-1
Jumper Table Summary
Selecting the CPU Frequency
JP1
1-2
2-3
2-3
1-2
JP2
1-2
1-2
2-3
2-3
CPU Frequency
Ratio
1.5x (3.5x)
2x
2.5x (1.75x)
3x
JP3
2-3
1-2
2-3
JP4
2-3
2-3
1-2
JP13
1-2 5-6
1-2 3-4
3-4
CPU External
Clock
50MHz
60MHz
66MHz
Note: The feature CPU Intel PP/MT 233MHz is using 1.5x
jumper setting for 3.5x frequency ratio, and AMD PR166 is
using 2.5x setting for 1.75x frequency ratio.
Note: The future CPUs have not been tested by AOpen
Quality Test Department. It is possible that this mainboard can
not support these future CPUs.
Intel
Pentium
P54C 75 75MHz = 1.5X 50MHz 1-2 & 1-2 2-3 & 2-3 1-2 & 5-6
P54C 90 90MHz = 1.5x 60MHz 1-2 & 1-2 1-2 & 2-3 1-2 & 3-4
P54C 100 100MHz = 1.5x 66MHz 1-2 & 1-2 2-3 & 1-2 3-4
P54C 120 120MHz = 2x 60MHz 2-3 & 1-2 1-2 & 2-3 1-2 & 3-4
P54C 133 133MHz = 2x 66MHz 2-3 & 1-2 2-3 & 1-2 3-4
P54C 150 150MHz = 2.5x 60MHz 2-3 & 2-3 1-2 & 2-3 1-2 & 3-4
P54C 166 166MHz = 2.5x 66MHz 2-3 & 2-3 2-3 & 1-2 3-4
P54C 200 200MHz = 3x 66MHz 1-2 & 2-3 2-3 & 1-2 3-4
CPU Core
Frequency
Ratio External
Bus
Clock
JP1 & JP2 JP3 & JP4 JP13
Intel
Pentium
PP/MT 150 150MHz = 2.5x 60MHz 2-3 & 2-3 1-2 & 2-3 1-2 & 3-4
PP/MT 166 166MHz = 2.5x 66MHz 2-3 & 2-3 2-3 & 1-2 3-4
PP/MT 200 200MHz = 3x 66MHz 1-2 & 2-3 2-3 & 1-2 3-4
PP/MT 233 200MHz = 3.5x 66MHz 1-2 & 1-2 2-3 & 1-2 3-4
CPU Core
Frequency
Ratio External
Bus
Clock
JP1 & JP2 JP3 & JP4 JP13
A-2
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