American Megatrends MegaRUM II Settings 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.
Pins
CPU Speed
1 - 2
233 MHz
266 MHz
300 MHz
333 MHz
x = short pins
Pins
CPU Speed
1 - 2
350 MHz
400 MHz
450 MHz
500 MHz
550 MHz
600 MHz
x = short pins

66 MHz Bus

Pins
3 - 4
x
x
x

100 MHz Bus

Pins
3 - 4
x
x
x
x x
Pins Pins
5 - 6 7 - 8
x
x x
x x
x x
Pins Pins
5 - 6 7 - 8
x
x x
x
x x
x
x