American Megatrends MegaRUM Service manual

Jumper Settings
MegaRUM (Series 758)
J-21
CPU Speed Pins
1 - 2
133 MHz x
150 MHz
166 MHz x
180 MHz
200 MHz x
210 MHz
233 MHz x
240 MHz
266 MHz x
300 MHz x
333 MHz x
x = short pins
J-24
CPU Speed Pins
1 - 2 Pins 3 - 4 Pins 5 - 6 Pins 7 - 8
133 MHz x x x x
150 MHz xxx
166 MHz xxx
180 MHz x x x
200 MHz x x x
210 MHz x x
233 MHz x x
240 MHz x x x
266 MHz x x x
300 MHz x x
333 MHz x x
x = short pins

Core voltages for J5 and J15
J5 - Is the Core Voltage for CPU Slot 1
J15 - Is the Core Voltage for CPU Slot 2
Voltage Settings for J5 and J15 are the same
CPU
Voltage Pins 1 - 2 Pins 3 - 4 Pins 5 - 6 Pins 7 - 8 Pins 9- 10
3.50 Volts xxxx
3.40 Volts xxxx
3.3 Volts x x x
3.2 Volts x x
3.0 Volts x
2.9 Volts x
2.8 Volts x
2.7 Volts xxx
2.6 Volts x x
2.5 Volts x
2.4 Volts x
2.3 Volts x x
2.2 Volts x
2.1 Volts x
2.05 Volts x xxxx
2.0 Volts x x x x
1.95 Volts x x x x
1.90 Volts x x x
1.85 Volts x x x x
1.8 Volts x x x
x = short pins
System Jumpers
J35 – CMOS Drain which can be used to erase the CMOS settings and Password.
Pins 1-2 Open = Normal Operation
Pins 1-2 Shorted = The contents of CMOS RAM are erased.
J13 – Is for the PCI interrupt enable for on board PCI VGA.