American Megatrends Apollo IV User Manual page 18

American megatrends apollo iv motherboards: user guide

Table of Contents

Step 3 Configure CPU

Perform the following steps to configure the

External CPU Clock CLK1, CLK2, and CLK3 are 3-pin bergs that set the CPU external clock

frequency. This motherboard may have any of four different clock generators:

IMI652,

ICS 9147,

ICW, or

PhaseLink.

The CLK1, CLK2, and CLK3 settings are different with the different clock

generators. You must determine the clock generator type (it's next to the

CPU) before setting these jumpers.

IMI 652 Clock Generator The following CLK1, CLK2, and CLK3 settings apply only if an

IMI 652 clock generator is mounted on the motherboard.

External

CLK1

(CPUCLK)

66 MHz

Short Pins 1-2

60 MHz

Short Pins 2-3

55 MHz

Short Pins 2-3

50 MHz

Apollo IV PCI Pentium ISA Motherboard User's Guide

Important

motherboard before installing a CPU.

CLK2

Short Pins 1-2

Short Pins 2-3

N/A

FREQ1

Short Pins 2-3

N/A

Cont'd

Table of Contents

Apollo iv pentium pci isa