American Megatrends MegaRUM II Service manual

Jumper Settings
MegaRUM II (Series 774)
If using two CPUs with different speed ratings, set the motherboard jumpers to the lower CPU
speed. When JP6 is open, the memory bus frequency is determined by the processors. When
JP6 is shorted, the memory bus frequency is forced to be 66 MHz.
66 MHz Bus
CPU Speed Pins
1 - 2 Pins 3 - 4 Pins 5 - 6 Pins 7 - 8
233 MHz x x
266 MHz xxx
300 MHz x x x
333 MHz x x
x = short pins
100 MHz Bus
CPU Speed Pins
1 - 2 Pins 3 - 4 Pins 5 - 6 Pins 7 - 8
350 MHz x x
400 MHz xxx
450 MHz x x
500 MHz x x
550 MHz x
600 MHz x x x
x = short pins