American Megatrends Super Voyager VLB-III, User Manual, Page: 102 / 138

Chapter 4 AMIBIOS Setup
92
Advanced Setup, Continued
External Clock for 100MHz DX4
This option specifies the external clock speed for a 100 MHz 486DX4 CPU.
The settings are
50MHz
or
33 MHz.
The Optimal and Fail-Safe default
settings are
50MHz.
Important
You must select the proper voltage
for the 486DX4 CPU. Short Pins 1-
2, 3-4, and 5-6 on J56.
A 100 MHz 486DX4 CPU can be configured in two ways:
This
optio
n
CPU
Speed
Exter
nal
Speed
Motherboard Jumper
Settings
50
MHz
100
MHz
50
MHz
Pins 1-2 of J37 must be
shorted.
J11, J12, and J15 should
all be OPEN.
33
MHz
100
MHz
33.33
MHz
J37, J11, and J15 must
be OPEN.
A shorting bridge must
be installed on J12.